**System Information**
On a PC
CPU: Intel Core i5=5300 CPU @ 2.3 GHz
RAM: 8 GB
GFX: nVidia Geforce 7600 GT, 256MB
OS: Windows 7 Enterprise
On Macintosh
CPU: Intel Core i5
RAM: 8 GB
GFX: I don't remeber, sorry
OS: MacOS Sierra
**Blender Version**
Broken: (example: 2.78a)
**Short description of error**
If I star the game engine I have no problems. Blender crashes only when I exit. Sometimes without playing at all. ALWAYS if I shoot first (LMB). This doesn't happen if everything is in the same file, instead of using LibLoad to load the map.
**Exact steps for others to reproduce the error**
Open main, start playing, press LMB, then press ESC
Thank you for your help.