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

REAL argument is unset
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called from - gml_Script_scr_movement (line 263)
called from - gml_Object_oPlayer_Other_10 (line 85)
called from - gml_Script_AdvanceGameFrame (line 36)
called from - gml_Script_NetworkAdvanceFrame (line 201)
called from - gml_Object_NetworkManager_Step_0 (line 231)

It only crashes when player 2 is Weegee by Roman Flour on Aether mode.