jqXHR undefined javascript error when deleting an empty row form list

Hey,

When I use this plugin as part of a list element, there’s a bug.

Here is how to replicate:

1. When a user is filling the form with a list element that contains the AJAX upload, they click the “+” symbol to add a new row.
2. let’s say they clicked the + by accident, so in the second row, they do not upload a photo and click the – symbol to remove the row
3. They are presented with a javascript error “jqXHR is undefined” and are unable to delete the second row

Solution:

Edit gravity-forms-ajax-upload.php
Line: 325

Old:
jqXHR.abort( row );

New:

if(typeof jqXHR !== "undefined")
{
	jqXHR.abort( row );
}

This fixed the issue for me.