Seemingly random crashes where hl2.exe crashes

Hi! I’ve had 2 seemingly random crashes today whilst playing TTT. Here’s the crash file:

I’d appreciate if you could help me. Thanks!

MDMP suggests nothing out of the ordinary except for this

697(1172.806421):  ERROR: Trying to derive entity apb_boombox from non existant entity base_gmodentity!

However I don’t think this is an issue. I’ve had random TTT crashes before but never figured out why.