I got this crash report after I tried to play a demo.
Note: I tried to play the demo with the '-nogl' command-line option, when I removed the line, GZDoom played the demo
-nogl disables significant parts of the engine, most notably the GL node builder. That means you played the demo back with different nodes than it was recorded with. Any such attempt will produce completely unpredictable results - sometimes even crashes.
The demo is just a recording of network commands . Your demo crashed while receiving such a network command from the demo playback code. Unless you send me the specific demo and all the WADs being loaded (which doesn't seem an option considering the stuff you loaded) so I can test it myself I'm afraid that I can't do anything about it. The crash is untraceable.