Rain of arrows on top of enemy stronghold crashes the game 100%

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ERROR in
action number 1
of Draw Event
for object obj_bcon:

array_get :: Index [1012] out of range [15]
at gml_Script_show_debug_army
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gml_Script_show_debug_army (line -1)
gml_Object_obj_bcon_Draw_64

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Edit : After some further experimentation it seems to crash with whatever spell moves units around.

I Also used the "War" Option in Cloud Palace and freezes the game. Waiting for up to 10 minutes and nothing happens. Map has water areas (Treasure Isle)

"Peace" option functions normally.