Ticket #6551: fix_get_adjacent_post.diff

wp-includes/link-template.php

@@ -554 +554 @@
                         }
 
                         if ( !empty($excluded_categories) ) {
-                                $posts_in_ex_cats_sql = " AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')';
+                                $posts_in_ex_cats_sql = " AND tt.taxonomy = 'category' AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')';
                         }
                 }
         }