0.6.7 Crash

Tried to battle a god, when pressing to confirm the difficulty and travel to them to fight, it crashed.
I had a team with 1 avatar in it.


############################################################################################
ERROR in
action number 1
of Key Press Event for E-key Key
for object obj_gatemenu:

STRING argument is unset############################################################################################
gml_Script_save_int (line 2)
gml_Script_scr_SaveMain (line 657)
gml_Script_scr_SaveGame (line 19)
gml_Object_obj_gatemenu_KeyPress_69 (line 239)