Crash: Realm 18 Boss

Windows, 0.0.4
I was finishing up the boss fight (I think, it keeps making that unclear) and the game crashed. My Spider Occultist was in the process of its Trait casting Magic Missile. Here’s the error box:


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

Variable obj_battlecontroller.intelligence(100147, -2147483648) not set before reading it.
at gml_Script_crit_intelligence
############################################################################################

stack frame is
gml_Script_crit_intelligence (line -1)
gml_Script_bc_GetRandomDebuff
gml_Script_bc_CreatureStartOfTurn
gml_Object_obj_battlecontroller_Step_0