Ticket #2609: 2609.diff

wp-admin/categories.php

@@ -44 +44 @@
         $cat_ID = (int) $_GET['cat_ID'];
         $cat_name = get_catname($cat_ID);
 
-        if ( 1 == $cat_ID )
+        // Don't delete the default cats.
+    if ( $cat_ID == get_option('default_category') )
                 die(sprintf(__("Can't delete the <strong>%s</strong> category: this is the default one"), $cat_name));
 
+    if ( $cat_ID == get_option('default_link_category') )
+                die(sprintf(__("Can't delete the <strong>%s</strong> category: this is the default one for bookmarks"), $cat_name));
+
         wp_delete_category($cat_ID);
 
         header('Location: categories.php?message=2');