Ticket #2789: 2789.diff

wp-admin/admin-db.php

@@ -156 +156 @@
         $cat_ID = (int) $cat_ID;
 
         // Don't delete the default cat.
-        if (1 == $cat_ID)
+        if ($cat_ID == get_option('default_category'))
                 return 0;
 
         $category = get_category($cat_ID);

wp-admin/categories.php

@@ -44 +44 @@
 
         $cat_name = get_catname($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));
 
         wp_delete_category($cat_ID);