Ticket #22504: 22504.diff

wp-admin/js/custom-header.js

@@ -17 +17 @@
                         var $el = $(this);
                         event.preventDefault();
 
+                        if ( frame ) {
+                                frame.open();
+                                return;
+                        }
+
                         frame = wp.media({
                                 title:     $el.data('choose'),
                                 library:   {