Oh no. After so many tries I completed those arenas as sorceress and could go a little further than usual in that spike zone afterwards and that's what I got. -_-
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FATAL ERROR in
action number 1
of Step Event0
for object obj_player_push:
Unable to find any instance for object index '137843' name '<undefined>'
at gml_Object_obj_player_push_Step_0
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stack frame is
gml_Object_obj_player_push_Step_0 (line -1)
It happened when I teleported to that green slime thing on the wall.