New Order Bug

Checking out the plugin, looks good so far. Looks like there is a bug when adding a new order in the backend — when trying to add a product, the ajax times out and produces the following PHP error:

PHP Fatal error: Uncaught Error: Call to a member function get_items() on bool in /public_html/wp-content/plugins/stock-locations-for-woocommerce/app/traits/trait-slw-order-item.php:358