Ticket #9018: 9018.diff

wp-admin/widgets.php

@@ -89 +89 @@
         ob_end_clean();
 
         // Prophylactic.  Take out empty ids.
-        foreach ( (array) $_POST['widget-id'] as $key => $val )
-                if ( !$val )
-                        unset($_POST['widget-id'][$key]);
+        if ( isset($_POST['widget-id']) )
+                foreach ( (array) $_POST['widget-id'] as $key => $val )
+                        if ( !$val )
+                                unset($_POST['widget-id'][$key]);
 
         // Reset the key numbering and store
         $new_sidebar = isset( $_POST['widget-id'] ) && is_array( $_POST['widget-id'] ) ? array_values( $_POST['widget-id'] ) : array();