[02:01:38 ERROR]: Could not pass event CreatureSpawnEvent to PaperTweaks v0.6.0-SNAPSHOT java.lang.IllegalArgumentException: Material cannot be null at com.google.common.base.Preconditions.checkArgument(Preconditions.java:141) ~[guava-33.5.0-jre.jar:?] at org.bukkit.inventory.ItemStack.(ItemStack.java:150) ~[paper-api-26.1.2.build.64-stable.jar:?] at org.bukkit.inventory.ItemStack.(ItemStack.java:138) ~[paper-api-26.1.2.build.64-stable.jar:?] at org.bukkit.inventory.ItemStack.(ItemStack.java:125) ~[paper-api-26.1.2.build.64-stable.jar:?] at PaperTweaks-0.6.0-SNAPSHOT-all.jar//me.machinemaker.papertweaks.modules.hermitcraft.wanderingtrades.Trade.createTrade(Trade.java:50) ~[?:?] at PaperTweaks-0.6.0-SNAPSHOT-all.jar//me.machinemaker.papertweaks.modules.hermitcraft.wanderingtrades.EntityListener.onCreatureSpawn(EntityListener.java:56) ~[?:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-26.1.2.build.64-stable.jar:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:71) ~[paper-api-26.1.2.build.64-stable.jar:?] at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-26.1.2.build.64-stable.jar:?] at org.bukkit.event.Event.callEvent(Event.java:46) ~[paper-api-26.1.2.build.64-stable.jar:?] at org.bukkit.craftbukkit.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:803) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at org.bukkit.craftbukkit.event.CraftEventFactory.doEntityAddEventCalling(CraftEventFactory.java:722) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.level.ServerLevel.addEntity(ServerLevel.java:1640) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.level.ServerLevel.addFreshEntity(ServerLevel.java:1567) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.world.level.ServerLevelAccessor.lambda$addFreshEntityWithPassengers$0(ServerLevelAccessor.java:19) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411) ~[?:?] at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:803) ~[?:?] at net.minecraft.world.level.ServerLevelAccessor.addFreshEntityWithPassengers(ServerLevelAccessor.java:19) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.level.ServerLevel.tryAddFreshEntityWithPassengers(ServerLevel.java:1659) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.commands.SummonCommand.createEntity(SummonCommand.java:99) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.commands.SummonCommand.spawnEntity(SummonCommand.java:111) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.commands.SummonCommand.lambda$register$0(SummonCommand.java:43) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.3.10.jar:?] at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:30) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:13) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:104) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:469) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.Commands.performCommand(Commands.java:377) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.commands.Commands.performCommand(Commands.java:365) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2426) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$0(ServerGamePacketListenerImpl.java:2399) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:205) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1569) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:194) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:179) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1549) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1543) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.recordTaskExecutionTimeWhileWaiting(MinecraftServer.java:1273) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1389) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304) ~[paper-26.1.2.jar:26.1.2-64-2186e1e] at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?] [02:01:38 INFO]: [U5B_: Summoned new Wandering Trader]