If I LibLoad my map everything works fine but Blender crashes when I press esc
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System Information
On a PC
CPU: Intel Core i5=5300 CPU @ 2.3 GHz
GFX: Nvidia GeForce 7600 GT, 256MB
OS: Windows 7 Enterprise
On Macintosh
CPU: Intel Core i7 2.9 GHz
RAM: 8 GB 1600 MHz DDR3
GFX: Intel HD Graphics 4000 1536 MB
OS: MacOS Sierra

Blender Version
Broken: (example: 2.78a)

Short description of error
When I star the game engine I have no problems. Blender crashes only when I exit (by pressing ESC). Sometimes I just have to start and esc and it crashes without playing at all. It ALWAYS crashes if, while playing, I shoot at least once (by pressing LMB). This doesn't happen if everything is in one file, instead of using LibLoad to load the map from a separate file.

Exact steps for others to reproduce the error
Open main, start playing, press LMB at least once, then press ESC

Here is the crash report.

Thank you for your help.