No problem! It happens in GMS2 2.3.0 (0.529 IDE version) and right when I try to run the projects with no modifications. The projects do undergo a conversion when importing or loading up for the first time, but no error is generated.
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ERROR in
action number 1
of Create Event
for object obj_init:
DoAdd :1: illegal array use
at gml_Object_obj_init_Create_0 (line 238) - global.spells[e_spell_types.heal, e_spell_stats.min_value] = 8 + global.pl_stats[e_pl_stats.level];
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gml_Object_obj_init_Create_0 (line 238)