Ticket #14893: 14893.patch

wp-admin/widgets.php

@@ -66 +66 @@
 function retrieve_widgets() {
         global $wp_registered_widget_updates, $wp_registered_sidebars, $sidebars_widgets, $wp_registered_widgets;
 
-        $_sidebars_widgets = array();
+        $_sidebars_widgets = array( 'wp_inactive_widgets' => array() );
         $sidebars = array_keys($wp_registered_sidebars);
 
         unset( $sidebars_widgets['array_version'] );
@@ -90 +90 @@
         if ( !empty($sidebars_widgets) ) {
                 foreach ( $sidebars_widgets as $lost => $val ) {
                         if ( is_array($val) )
-                                $_sidebars_widgets['wp_inactive_widgets'] = array_merge( (array) $_sidebars_widgets['wp_inactive_widgets'], $val );
+                                $_sidebars_widgets['wp_inactive_widgets'] = array_merge( $_sidebars_widgets['wp_inactive_widgets'], $val );
                 }
         }