Gmod randomly crashes

I started single player with the map “escape_02” from Portal. I spawn in the cake room, and spawn a purple core. I move the core with the physgun to and throw it up to the ceiling, and gmod crashes, giving me this error

Please help

have you tried reinstalling Garry’s Mod?
Updating cache integrity via Steam?

It might be caused by the map itself, try re-downloading the map and trying again.
Also if it is an Add-on from the Workshop, delete it and re-download… otherwise its just the tables messed up in the map.