Garry's Mod crashes when I try to save

So I loaded a map on singleplayer yesterday and goofed around, created some stuff, fucked around with the NPCs, and other stuff like that. I wanted to save my creations, so I typed in gm_save in console. Whenever I type that in, the game just randomly crashes and closes out on me. When I get back on Garry’s Mod and type in gm_load, the game says I never saved anything.

Any fixes? Am I doing it wrong? Will it be fixed? Will it not?

No answers?