Ticket #22116: 22116.patch

wp-includes/widgets.php

@@ -845 +845 @@
                 $index = "sidebar-$index";
         } else {
                 $index = sanitize_title($index);
-                foreach ( (array) $wp_registered_sidebars as $key => $value ) {
-                        if ( sanitize_title($value['name']) == $index ) {
-                                $index = $key;
-                                break;
+                if ( empty( $wp_registered_sidebars[$index] ) ) {
+                        foreach ( (array) $wp_registered_sidebars as $key => $value ) {
+                                if ( sanitize_title($value['name']) == $index ) {
+                                        $index = $key;
+                                        break;
+                                }
                         }
                 }
         }