Fatal error code 2

Windows 10
0.0.25


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FATAL ERROR in
action number 1
of Key Press Event for E-key Key
for object obj_roomchanger:

Unable to find any instance for object index ‘146451’ name ‘’
at gml_Script_save_Item
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stack frame is
gml_Script_save_Item (line -1)
gml_Script_save_Creature
gml_Script_scr_SaveMain
gml_Script_scr_SaveGame
gml_Object_obj_roomchanger_KeyPress_69
called from - gml_Object_obj_roomchanger_Step_0 (line -1) -

was warping into realm 18 when this popped up.