Game crashes or hangs at the end of the tutorial part 1

[Tnaren]

I've been trying to play the in-game tutorial, but it seems to either crash or freeze/hang at the "starting game..." screen right before Part 2 of the tutorial. If it freezes instead of crashing then the process will still need to be manually killed.

Running version 1.13.8 of Wesnoth on Xubuntu 17.04 x86_64
My laptop is an old Toshiba Satellite L755 with a 2.10 GHz Pentium CPU, 4 GB RAM, and first generation Intel HD Graphics.

I've attached the output from the gdb backtrace and the information from in-game system report.

[gfgtdf]

thx, this could probably fix this by addong a .valid() check at the start of impl_track_set, but it'd probably be better if impl_music_get wouldn't create invlid tracks in the first place (return nil for invalid integer keys instead of an inalid lua_music_track struct), not sure tohugh.