Builds

1.16.5
Forge 36.1.4
Mowzie v1.5.16

[21:03:27] [Server thread/FATAL] [minecraft/ThreadTaskExecutor]: Error executing task on Server
java.lang.NullPointerException: null
at com.bobmowzie.mowziesmobs.server.message.mouse.MessageRightMouseUp$Handler.accept(MessageRightMouseUp.java:40) ~[mowziesmobs:1.5.16]
at com.bobmowzie.mowziesmobs.server.message.mouse.MessageRightMouseUp$Handler.lambda$accept$0(MessageRightMouseUp.java:33) ~[mowziesmobs:1.5.16]
at net.minecraftforge.fml.network.NetworkEvent$Context.enqueueWork(NetworkEvent.java:215) ~[forge:?]
at com.bobmowzie.mowziesmobs.server.message.mouse.MessageRightMouseUp$Handler.accept(MessageRightMouseUp.java:33) ~[mowziesmobs:1.5.16]
at com.bobmowzie.mowziesmobs.server.message.mouse.MessageRightMouseUp$Handler.accept(MessageRightMouseUp.java:28) ~[mowziesmobs:1.5.16]
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.lambda$tryDecode$3(IndexedMessageCodec.java:128) ~[forge:?]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_271]
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.tryDecode(IndexedMessageCodec.java:128) ~[forge:?]
at net.minecraftforge.fml.network.simple.IndexedMessageCodec.consume(IndexedMessageCodec.java:162) ~[forge:?]
at net.minecraftforge.fml.network.simple.SimpleChannel.networkEventListener(SimpleChannel.java:80) ~[forge:?]
at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:247) ~[eventbus-4.0.0.jar:?]
at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:239) ~[eventbus-4.0.0.jar:?]
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?]
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?]
at net.minecraftforge.fml.network.NetworkInstance.dispatch(NetworkInstance.java:86) ~[forge:?]
at net.minecraftforge.fml.network.NetworkHooks.lambda$onCustomPayload$1(NetworkHooks.java:90) ~[forge:?]
at java.util.Optional.map(Unknown Source) ~[?:1.8.0_271]
at net.minecraftforge.fml.network.NetworkHooks.onCustomPayload(NetworkHooks.java:90) ~[forge:?]
at net.minecraft.network.play.ServerPlayNetHandler.func_147349_a(ServerPlayNetHandler.java:1413) ~[?:?]
at net.minecraft.network.play.client.CCustomPayloadPacket.func_148833_a(CCustomPayloadPacket.java:42) ~[?:?]
at net.minecraft.network.play.client.CCustomPayloadPacket.func_148833_a(CCustomPayloadPacket.java:12) ~[?:?]
at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) ~[?:?]
at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?]
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?]
at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:734) ~[?:?]
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:159) ~[?:?]
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?]
at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:717) ~[?:?]
at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:711) ~[?:?]
at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213160_bf(SourceFile:103) ~[?:?]
at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:696) ~[?:?]
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:646) ~[?:?]
at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_271]

Duplicate issue. Already fixed.