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FATAL ERROR in
action number 1
of Other Event: User Defined 0
for object oPlayer:

STRING argument is unset
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--------------------------------------------------------------------------------------------
called from - gml_Script_ai_update (line 42)
called from - gml_Object_oPlayer_Other_10 (line 79)
called from - gml_Script_AdvanceGameFrame (line 36)
called from - gml_Script_NetworkAdvanceFrame (line 201)
called from - gml_Object_NetworkManager_Step_0 (line 231)

Apparently do NOT play a match with this thing against Golden Ronald, Omega Flowey, and the Sonic Plush. I've learned that the hard way.