Notice: Trying to get property ‘id’ of non-object

Hi, thank you for your great plugin.

Here is a notice that I get when I import some data:

Notice: Trying to get property 'id' of non-object in wp-content/plugins/woo-product-attachment/admin/class-woocommerce-product-attachment-admin.php on line 1848

Explanation: $screen can be null when the screen is not defined (during an import for instance). See https://developer.wordpress.org/reference/functions/get_current_screen/