Crash Report During Combat

I received the following error report and crash today:


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

Push :: Execution Error - Variable Index [0,6] out of range [1,4] - -5.creatureList(100025,6)
at gml_Script_bc_CreatureStartOfTurn
############################################################################################

stack frame is
gml_Script_bc_CreatureStartOfTurn (line -1)
gml_Object_obj_battlecontroller_Step_0

I’ll be happy to give more detail if it will be helpful.