Index out of range on List/Pantry View Controller after signing out and back in

[cole-k]

The error is on Line 82 of InventoryTableViewController.swift, the line in question is a part of the method below

80    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
81        // The number of rows is equal to the number of items.
82        return itemListPantryInstance.dict[type]![groupIDs[section]]!.count
83    }