Once all inventory slots are full and you get a message in game saying that it's full and cannot carry any more items, trying to get rid of an item or using all of one type of item (ie eating all the berries you have on you) crashes the game and gives the error pasted below.

I have made a new game to test it out and the same thing happens every time it seems.

Fun little game though!

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FATAL ERROR in
action number 1
of Mouse Event for Left Pressed
for object objRingMenuItem:

Push :: Execution Error - Variable Index [20,0] out of range [20,-1] - 3.<unknown variable>(100048,640000)
at gml_Script_RemoveItem
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stack frame is
gml_Script_RemoveItem (line 0)
gml_Object_objRingMenuItem_Mouse_4