Fatal Error code

Windows 10
Version 0.0.25


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

Variable obj_condition.ticks(100150, -2147483648) not set before reading it.
at gml_Script_bc_EventBuff
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stack frame is
gml_Script_bc_EventBuff (line -1)
gml_Script_bc_CreatureCast
gml_Script_bc_Turn
gml_Object_obj_battlecontroller_Step_0

i tried to cast a spell (the one that grants 3 buffs on a single target (mend, barrier, and one other.) on one of my creatures on level 12 or 13. This poped up, thought i should let you know.