Players kicked "Failed to deliver packet"

[lone marsh]

Multiple Bedrock Players just lost connection.
All related to Failed to deliver packet, sending fallback clientbound/minecraft:system_chat

https://dump.geysermc.org/iNydA7KlKIH1MUPg3F8gclH33lAIA8Y3

[10:50:01 INFO]: +Rumi7963 lost connection: Disconnected
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +DJminceraft disconnected
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +N3GL3CT_CAV disconnected
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +Inky8424 disconnected
[10:50:01 INFO]: [-] +Rumi7963
[10:50:01 INFO]: +Inky8424 lost connection: Disconnected
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +TimedXexe disconnected
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +JonasAxolotl disconnected
[10:50:01 WARN]: Failed to deliver packet, sending fallback clientbound/minecraft:system_chat
io.netty.channel.StacklessClosedChannelException
        at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source) ~[netty-transport-4.2.7.Final.jar:4.2.7.Final]
[10:50:01 WARN]: Failed to deliver packet, sending fallback clientbound/minecraft:system_chat
io.netty.channel.StacklessClosedChannelException
        at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source) ~[netty-transport-4.2.7.Final.jar:4.2.7.Final]
[10:50:01 INFO]: [floodgate] Floodgate player logged in as +Yeet86041 disconnected
[10:50:01 WARN]: Failed to deliver packet, sending fallback clientbound/minecraft:system_chat
io.netty.channel.StacklessClosedChannelException
        at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source) ~[netty-transport-4.2.7.Final.jar:4.2.7.Final]
[10:50:01 INFO]: [-] +Inky8424
[10:50:01 INFO]: +Yeet86041 lost connection: Disconnected
[10:50:01 INFO]: [-] +Yeet86041
[10:50:01 INFO]: +N3GL3CT_CAV lost connection: Disconnected
[10:50:02 INFO]: [-] +N3GL3CT_CAV
[10:50:02 INFO]: +DJminceraft lost connection: Disconnected
[10:50:02 INFO]: [-] +DJminceraft
[10:50:02 INFO]: +TimedXexe lost connection: Disconnected
[10:50:02 INFO]: +JonasAxolotl lost connection: Disconnected

[loud socket]

<:geyser:723981877773598771> Geyser Velocity

Git info

Up to date: Yes
Commit: 00feb5e
Branch: master

Listen address

0.0.0.0:19132 (internal IP)

Remote address

Direct connection

Auth type

FLOODGATE

Server platform

Velocity 3.5.0-SNAPSHOT (git-d11511c1-b584)

Mar 25, 2026, 2:55 PM

[loud socket]

Found errors in the log!

See below for details and possible fixes

ClosedChannelException

This error can be caused by various things. Please upload your logs using https://mclo.gs/ and paste them in #support.
If you are getting this error on a proxy server such as Velocity or BungeeCord, check your backend server logs for errors.

[lone marsh]

https://mclo.gs/lhXDpQr

[loud socket]

Found errors in the log!

See below for details and possible fixes

Outdated server

This error means that you need to update your server/proxy to the latest version or install the ViaVersion plugin.
Run !download viaversion in #bot-spam.
Please read this when considering what Minecraft version to use for your server: https://madelinemiller.dev/blog/which-minecraft-version/

java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "Object.getClass()" because "o" is null

Unknown fix!
Class: ReflectionUtils
Method: setValue
Line: 408
Link: ReflectionUtils.java#L408

[shell cipher]

Update McXboxBroadcast

Update Velocity

Update Geyser and read #announcements message

[shell cipher]

@lone marsh

[lone marsh]

Since updating I haven't ran into the issue again, but not sure if it's fixed or just not happening often

[gleaming finch]

Closing as resolved.