Actually, I had forgotten I could die to go to the shop fast. Here it is :
___________________________________________
############################################################################################
ERROR in
action number 1
of Step Event0
for object oShopItem:
Unable to find instance for object index 12
at gml_Object_oShopItem_Step_0
############################################################################################
gml_Object_oShopItem_Step_0 (line -1)
I have absolutely no idea of what I'm doing different when it happens though.
Now I got the Starvation ending too by the way.