I keep running into this issue when defeating the boss battle on the first world.
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FATAL ERROR in
action number 1
of Draw Event
for object obj_battle_end_controller:
DoAdd :: Execution Error
at gml_Script_tech_get_sprite
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stack frame is
gml_Script_tech_get_sprite (line -1)
gml_Object_obj_battle_end_controller_Draw_64