Updated JS to ignore hidden next button when adding the spinner to the form so it does not add two.

js/spinner.js

@@ -22,6 +22,8 @@
       });
       for (var base in settings.spinner) {
         var id = '#' + base;
+        // Don't add spinner to the hidden next/ingest button.
+        if (id != '#edit-hidden-next') {
           $(id, context).once('spinner', function () {
             var spinner = new Spinner(settings.spinner[base].opts);
             $(id).parents('form').one('submit', function (event) {
@@ -54,5 +56,6 @@
           });
         }
       }
+    }
   };
 })(jQuery);