battle crash

0.1.9v

windows 10

not really sure on details, there were no new to me creatures and i just attacked one as i usually do


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

Variable obj_artifact.(100064, -2147483648) not set before reading it.
at gml_Script_bc_GetEnemiesOf
############################################################################################

stack frame is
gml_Script_bc_GetEnemiesOf (line -1)
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
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gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_EventResurrect
gml_Script_bc_OnDeath
gml_Script_bc_ExecuteEvents
gml_Object_obj_battlecontroller_Step_0