During my exploration of the eastern area, after about an hour or so of gameplay the sound clipped and the game gave me the following error code:

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object FlameThrower:

audio_exists argument 1 incorrect type (5) expecting a Number (YYGI32)
############################################################################################
--------------------------------------------------------------------------------------------
called from - gml_Object_FlameThrower_Step_0 (line 39)

This happens every time I load my save because my last checkpoint was next to a flamethrower.