Crash Bug Log

[Migdalin]

No mods active.

I was engaging closest biter base to the NW. Game paused, like it meant to auto-save, then I got the error message and was returned to desktop.

[Migdalin]

Was able to replicate: it does appear to happen when I try to throw a poison capsule, which someone else has already reported.

[posila]

Thanks for the report.
Fixed in 0.15.15