Description of Bug: Can't make Green dye. I made some other color dye yesterday
Reproduction Steps:

1.  Take 10 sweetberries
2.  Drag onto pestle
3.  Error message (see below)

Error message (if applicable):

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ERROR in

action number 1

of Mouse Event for Glob Left Released

for object InventoryItem:

Variable InventoryItem.amt(100010, -2147483648) not set before reading it.

at gml_Script_CombineAmount

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gml_Script_CombineAmount (line -1)

gml_Script_CombineItems

gml_Object_InventoryItem_Mouse_56

Screenshots: