Crash at the end of battle

I crashed twice in Realm 4 when the ennemy summons a creature and all be this summoned creature are killed. The battle is won but a crash happens.

Error log :


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

Unable to find any instance for object index ‘106316’ name ‘’
at gml_Script_bc_ExecuteEvents
############################################################################################

stack frame is
gml_Script_bc_ExecuteEvents (line -1)
gml_Object_obj_battlecontroller_Step_0

Edit :
The summoned creature had a picture (A dragon).

Thanks, working on a patch for this now!