Crash in battle for unknown reasons

Hi,

I got the following crash during a battle (Win 10 x64, 0.10.0):


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

second index out of bounds request 0,1 maximum size is 1
############################################################################################

called from - gml_Script_bc_CreatureCast (line 30)
called from - gml_Script_bc_SpellsOnHit (line 280)
called from - gml_Script_bc_ExecuteEvents (line 173)
called from - gml_Object_obj_battlecontroller_Step_0 (line 264)

Pleas look also at the screenshot - maybe you can see why the crash occurred.
https://imgur.com/a/fKtC9tF

What did I do?
I followed my usually tactic increasing-decreasing-draining stats. Maybe it is because of the Gargantuan it was a new monster and after I wanted to finish it off the crash occurred - not cool :’(

Thank you for taking care - we all really appreciate your hard work.