I've tried completely reverting changes, re-extracting the zip, everything pretty standard, but for some reason I get the following error even after returning the project to it's completely original state. The Bug seems to have something to do with magic, as whenever I completely remove spells from global.party actions[], the game runs fine (just without fire or ice etc. of course).

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ERROR in

action number 1

of  Step Event0

for object oBattle:

trying to index a variable which is not an array

 at gml_Script_anon_anon_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_3955_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_4001_anon_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_3955_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0 (line 139) -                                           if (_option[0] == "Attack") return 99;

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gml_Script_anon_anon_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_3955_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_4001_anon_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_3955_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0 (line 139)

gml_Script_anon_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0_3955_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0 (line 146) -                                    return _Priority(_b) - _Priority(_a);

gml_Script_anon_gml_Object_oBattle_Create_0_1502_gml_Object_oBattle_Create_0 (line 135)

gml_Object_oBattle_Step_0 (line 42) -               if (!instance_exists(oMenu)) DoTurn(units[turn]);

Another thing to note, the crash only happens at the start of the turn involving the party member with spells like fire or ice.

Hey!  I'm having the exact same issue

Thanks! Will take a look at this asap

Ok I've found the issue, it's because I was setting menuOptions[i] to be the new top level action when compiling the menu. This means if we did a sub-menu action in between two top level actions (like magic) when the next top level action is added, i has increased by more than 1 and there will be 0s added in between.  For some reason this never threw an error previously. I'm really not sure why it didn't! This probably also explains why a similar error appeared for another user in HTML5. Thanks for the report, I'll upload a fix for this now.