Another error, I think they may be coming from pausing? Seem to get errors a few seconds after unpausing, hm:
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ERROR in
action number 1
of Draw Event
for object obj_shadow:
Variable <unknown_object>.image_index_get(100136, -2147483648) not set before reading it.
at gml_Object_obj_shadow_Draw_0
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gml_Object_obj_shadow_Draw_0 (line -1)