Looks like the plugin is trying to get a count of the open slots for the Divination Cart tab and throwing an exception on
StashUi.InventoryControl.Inventory.AvailableInventorySquares
I've fixed it for myself to always consider the divination card stash tab as not full, just posting in case a dev wants to take a look.
StashUi.InventoryControl.Inventory.AvailableInventorySquares
I've fixed it for myself to always consider the divination card stash tab as not full, just posting in case a dev wants to take a look.