[18:32:15] [Server thread/WARN]: Failed to execute Fabric Item Group event!
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.orElseThrow(Optional.java:377) ~[?:?]
	at knot/com.aetherteam.aether.item.AetherCreativeTabs.buildCreativeModeTabs(AetherCreativeTabs.java:407) ~[aether-1.21.1-1.5.4-fabric.jar:?]
	at knot/net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents.lambda$static$0(ItemGroupEvents.java:43) ~[fabric-item-group-api-v1-4.1.6+6823f7cd19-b04d89eab3540ee8.jar:?]
	at knot/eu.pb4.polymer.core.impl.PolymerImplUtils.callItemGroupEvents(PolymerImplUtils.java:323) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_1761.polymer$getContentsWith(class_1761.java:541) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:47) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_3324.md7caebc$polymer-networking$lambda$polymerNet$setupHandler$0$5(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.18+1.21.1-abca588ea9fb2511.jar:?]
	at knot/net.minecraft.class_3324.handler$hhf000$polymer-networking$polymerNet$setupHandler(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3324.method_14570(MixinPlayerList.java:202) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$43(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest$45(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.md7caebc$vmp$lambda$wrapOnPlayerConnect$1$4(class_8610.java:4575) ~[server-intermediary.jar:?]
	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:814) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
[18:32:15] [Server thread/WARN]: Failed to execute Fabric Item Group event!
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.orElseThrow(Optional.java:377) ~[?:?]
	at knot/com.aetherteam.aether.item.AetherCreativeTabs.buildCreativeModeTabs(AetherCreativeTabs.java:407) ~[aether-1.21.1-1.5.4-fabric.jar:?]
	at knot/net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents.lambda$static$0(ItemGroupEvents.java:43) ~[fabric-item-group-api-v1-4.1.6+6823f7cd19-b04d89eab3540ee8.jar:?]
	at knot/eu.pb4.polymer.core.impl.PolymerImplUtils.callItemGroupEvents(PolymerImplUtils.java:323) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_1761.polymer$getContentsWith(class_1761.java:541) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:47) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_3324.md7caebc$polymer-networking$lambda$polymerNet$setupHandler$0$5(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.18+1.21.1-abca588ea9fb2511.jar:?]
	at knot/net.minecraft.class_3324.handler$hhf000$polymer-networking$polymerNet$setupHandler(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3324.method_14570(MixinPlayerList.java:202) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$43(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest$45(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.md7caebc$vmp$lambda$wrapOnPlayerConnect$1$4(class_8610.java:4575) ~[server-intermediary.jar:?]
	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:814) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
[18:32:15] [Server thread/WARN]: Failed to execute Fabric Item Group event!
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.orElseThrow(Optional.java:377) ~[?:?]
	at knot/com.aetherteam.aether.item.AetherCreativeTabs.buildCreativeModeTabs(AetherCreativeTabs.java:407) ~[aether-1.21.1-1.5.4-fabric.jar:?]
	at knot/net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents.lambda$static$0(ItemGroupEvents.java:43) ~[fabric-item-group-api-v1-4.1.6+6823f7cd19-b04d89eab3540ee8.jar:?]
	at knot/eu.pb4.polymer.core.impl.PolymerImplUtils.callItemGroupEvents(PolymerImplUtils.java:323) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_1761.polymer$getContentsWith(class_1761.java:541) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:47) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_3324.md7caebc$polymer-networking$lambda$polymerNet$setupHandler$0$5(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.18+1.21.1-abca588ea9fb2511.jar:?]
	at knot/net.minecraft.class_3324.handler$hhf000$polymer-networking$polymerNet$setupHandler(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3324.method_14570(MixinPlayerList.java:202) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$43(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest$45(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.md7caebc$vmp$lambda$wrapOnPlayerConnect$1$4(class_8610.java:4575) ~[server-intermediary.jar:?]
	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:814) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
[18:32:15] [Server thread/WARN]: Failed to execute Fabric Item Group event!
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.orElseThrow(Optional.java:377) ~[?:?]
	at knot/com.aetherteam.aether.item.AetherCreativeTabs.buildCreativeModeTabs(AetherCreativeTabs.java:407) ~[aether-1.21.1-1.5.4-fabric.jar:?]
	at knot/net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents.lambda$static$0(ItemGroupEvents.java:43) ~[fabric-item-group-api-v1-4.1.6+6823f7cd19-b04d89eab3540ee8.jar:?]
	at knot/eu.pb4.polymer.core.impl.PolymerImplUtils.callItemGroupEvents(PolymerImplUtils.java:323) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_1761.polymer$getContentsWith(class_1761.java:541) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:47) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_3324.md7caebc$polymer-networking$lambda$polymerNet$setupHandler$0$5(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.18+1.21.1-abca588ea9fb2511.jar:?]
	at knot/net.minecraft.class_3324.handler$hhf000$polymer-networking$polymerNet$setupHandler(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3324.method_14570(MixinPlayerList.java:202) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$43(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest$45(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.md7caebc$vmp$lambda$wrapOnPlayerConnect$1$4(class_8610.java:4575) ~[server-intermediary.jar:?]
	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:814) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
[18:32:15] [Server thread/WARN]: Failed to execute Fabric Item Group event!
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.orElseThrow(Optional.java:377) ~[?:?]
	at knot/com.aetherteam.aether.item.AetherCreativeTabs.buildCreativeModeTabs(AetherCreativeTabs.java:407) ~[aether-1.21.1-1.5.4-fabric.jar:?]
	at knot/net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents.lambda$static$0(ItemGroupEvents.java:43) ~[fabric-item-group-api-v1-4.1.6+6823f7cd19-b04d89eab3540ee8.jar:?]
	at knot/eu.pb4.polymer.core.impl.PolymerImplUtils.callItemGroupEvents(PolymerImplUtils.java:323) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_1761.polymer$getContentsWith(class_1761.java:541) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:47) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.api.item.PolymerItemGroupUtils.getContentsFor(PolymerItemGroupUtils.java:39) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.payloads.s2c.PolymerItemGroupContentAddS2CPayload.of(PolymerItemGroupContentAddS2CPayload.java:30) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroupContents(PolymerServerProtocol.java:213) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.syncItemGroup(PolymerServerProtocol.java:199) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendCreativeSyncPackets(PolymerServerProtocol.java:186) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocol.sendSyncPackets(PolymerServerProtocol.java:126) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/eu.pb4.polymer.core.impl.networking.PolymerServerProtocolHandler.lambda$register$0(PolymerServerProtocolHandler.java:36) ~[polymer-core-0.9.18+1.21.1-659002abf83d0556.jar:?]
	at knot/net.minecraft.class_3324.md7caebc$polymer-networking$lambda$polymerNet$setupHandler$0$5(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/eu.pb4.polymer.common.api.events.SimpleEvent.invoke(SimpleEvent.java:28) ~[polymer-common-0.9.18+1.21.1-abca588ea9fb2511.jar:?]
	at knot/net.minecraft.class_3324.handler$hhf000$polymer-networking$polymerNet$setupHandler(MixinPlayerList.java:15999) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3324.method_14570(MixinPlayerList.java:202) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$method_14570$43(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest(class_8610.java:1038) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.mixinextras$bridge$wrapOperation$hhh000$polymer-networking$polymerNet$prePlayHandshakeHackfest$45(class_8610.java) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8610.md7caebc$vmp$lambda$wrapOnPlayerConnect$1$4(class_8610.java:4575) ~[server-intermediary.jar:?]
	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:162) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:864) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:173) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:136) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:846) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:840) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_5383(class_1255.java:121) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:814) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:702) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]