Modelbench bug

[Mercury 752]

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FATAL ERROR in
action number 1
of Draw Event
for object app:

ds_map_find_value argument 1 incorrect type (undefined) expecting a Number (YYGI32)
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called from - gml_Script_model_load (line 47)
called from - gml_Script_model_load_prepare (line 15)
called from - gml_Script_model_load_reset (line 55)
called from - gml_Script_popup_startup_draw (line 46)
called from - gml_Script_draw_popup (line 125)
called from - gml_Script_draw_window (line 132)
called from - gml_Object_app_Draw_64 (line 28)
 

Tried uploading my Dready, but here it came out.