A lot of people being kicked for Unexpected client behavior

Hello! Since I am not a regular I was told to message here instead of make a engine bug report.

Basically, my game, Ultra Unfair, Ultra unFair - Roblox recently had a new update. I do not believe I changed anything significant on the client, however, ever since the update countless players have been getting kicked for “Unexpected client behavior”. I know this is a roblox bug and its none of my kicks but I am unaware as to what is triggering it. People will get kicked while doing nothing, or from using abilities, or just doing very basic stuff such as switching abilities. I put a listener on every single remote to see if there was any weird remote behavior and there was not, with remotes only being fired when they should be.

I am getting many many complaints and I do not know what to do anymore. Sometimes people will even just join and then get kicked almost instantly.



We’ve filled a ticket into our internal database for this issue, and we will update you when we have further information.

Thanks for flagging!


Likely related issue was also raised a few days ago here:

I figured out the bug;

It was on our end.
This code originally is not mine (long story behind it all) and it has some messy and really bad code.

One of the anti-exploits was being triggered after an update and would be deleting the players from the game which would cause the unexpected client behavior kick, however I do believe this should still be fixed on Roblox’s end to make it more clear why they are being kicked for Unexpected client behavior


@Focia19 (thanks for your help :slight_smile: )

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That’s odd, the last time I tried destroying a player instance, it would just render the client unusable except moving your camera around and opening Roblox menus then it disconnects after a minute

Yep, that’s why I didn’t consider it, which is why I think it should still be fixed/indicated better.
Likely something with the new anti-cheat stuff

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