From 5b8efa96d4d08631ceda9ef2a1c82f4660b09803 Mon Sep 17 00:00:00 2001
From: Aryeh Gregor <simetrical@users.mediawiki.org>
Date: Thu, 20 Mar 2008 17:33:32 +0000
Subject: [PATCH] (bug 13454) Article::updateCategoryCounts can attempt to
 execute empty inserts.

---
 includes/Article.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/includes/Article.php b/includes/Article.php
index 10ff07574a..4404625ba2 100644
--- a/includes/Article.php
+++ b/includes/Article.php
@@ -3367,6 +3367,10 @@ class Article {
 		#
 		# Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
 		$insertCats = array_merge( $added, $deleted );
+		if( !$insertCats ) {
+			# Okay, nothing to do
+			return;
+		}
 		$insertRows = array();
 		foreach( $insertCats as $cat ) {
 			$insertRows[] = array( 'cat_title' => $cat );
-- 
2.20.1