this weird error message whenever I join the server

[Kiko]

earlier, I was rping after being doused in gasoline, and mid /me, I received this error message.

When I hit OK, the game just closed itself, so basically I crashed.

Then, I launched it again, and as soon as I joined the server, the message re-appeared. It tabbed me out, and weirdly enough, I could still hear the server intro music running in the background, but whenever I hit OK it just closed gmod.

I've still to try with other servers, and I'll make an update for that, but other than that, anyone else had this happen to them before?

e: it just went away by itself. I tried joining a darkrp server, it worked, then i joined neb, and it worked. maybe it'll come back though idk

 

[Man wearing a helmet]

Not much can be determined from the error message

Add -condebug to the game's launch options
Find console.log in \Steam\steamapps\common\GarrysMod\garrysmod
It may give you a smidgen of insight into what's causing it

Verify your game cache, delete and reinstall all your addons, and reinstall the game if that doesn't work.