Ticket #13246: 14431.diff

wp-includes/post.php

@@ -2078 +2078 @@
         if ( empty($post_category) || 0 == count($post_category) || !is_array($post_category) ) {
                 // 'post' requires at least one category.
                 if ( 'post' == $post_type )
-                        $post_category = array( get_option('default_category') );
+                        $post_category = array( 0 => get_option('default_category') );
                 else
                         $post_category = array();
         }