Code Error

Windows 10
Siralim 3 - Patch 0.23.6

I encountered an error while fighting a boss. It occurred when my creature’s artifact trait activated, it was a thrasher fiend with an artifact “start with splash” and “run free” trait. I guess I ran out of enemies to kill before the “run free” trait was able to complete its effect.

action number 1
of Draw Event
for object obj_battletargetselector:

Variable obj_misc.(100055, -2147483648) not set before reading it.
at gml_Script_bc_TargetSingleEnemy

stack frame is
gml_Script_bc_TargetSingleEnemy (line -1)