This is on 1.21.1 1.2.5

[16:09:01] [Netty Epoll Server IO #11/ERROR] [minecraft/Connection]: Exception caught in connection io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:system_chat' at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:14) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:104) ~[neoforge-21.1.115-universal.jar%23125!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:39) ~[neoforge-21.1.115-universal.jar%23125!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:90) ~[netty-codec-4.1.97.Final.jar%23104!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar%23104!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at TRANSFORMER/[email protected]/net.minecraft.network.Connection$2.write(Connection.java:528) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:940) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:306) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at TRANSFORMER/[email protected]/net.minecraft.network.Connection.doSendPacket(Connection.java:364) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.Connection.lambda$sendPacket$12(Connection.java:359) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413) ~[netty-transport-classes-epoll-4.1.97.Final.jar%23109!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {} Caused by: io.netty.handler.codec.EncoderException: Failed to encode: Value must be within range [1;99]: 0; Item must not be minecraft:air literal{3.02/m ago}[style={color=gray,hoverEvent=TypedHoverEvent[action=<action show_text>, value=literal{Fri Mar 07 16:06:00 CET 2025}[style={color=gray}]]}, siblings=[literal{ }, literal{-}[style={color=red}], literal{ }, literal{HistoryNoob}[style={color=#FCBA03}], literal{ }, literal{killed}, literal{ }, literal{creeper}[style={color=#FCBA03,hoverEvent=TypedHoverEvent[action=<action show_item>, value=net.minecraft.network.chat.HoverEvent$ItemStackInfo@32b38f6d]}], literal{ }, literal{(x72/y66/z26)}[style={color=gray,clickEvent=ClickEvent{action=RUN_COMMAND, value='/tp 72 66 26'},hoverEvent=TypedHoverEvent[action=<action show_text>, value=literal{Click to teleport to this position.}]}]]] at TRANSFORMER/[email protected]/net.minecraft.network.codec.ByteBufCodecs$19.lambda$encode$1(ByteBufCodecs.java:311) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) ~[datafixerupper-8.0.16.jar%23102!/:?] {} at TRANSFORMER/[email protected]/net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:311) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:301) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$8.encode(StreamCodec.java:156) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:97) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:87) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23124!/:?] {re:classloading} ... 31 more

happens when i try to query a mob kill event.