Don't attempt to insert if there are no rows.

diff --git a/includes/Article.php b/includes/Article.php
index 4404625..dd1ab2c 100644 (file)
--- a/includes/Article.php
+++ b/includes/Article.php
@@ -3375,7 +3375,8 @@ class Article {
                foreach( $insertCats as $cat ) {
                        $insertRows[] = array( 'cat_title' => $cat );
                }
-               $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
+               if ( count( $insertRows ) )
+                       $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
 
                $addFields    = array( 'cat_pages = cat_pages + 1' );
                $removeFields = array( 'cat_pages = cat_pages - 1' );