From a8d7ff1742e0674ce5ecdf4ccbba3ec65c535ff2 Mon Sep 17 00:00:00 2001
From: Peter Westwood <westi@git.wordpress.org>
Date: Sat, 27 Sep 2008 09:53:43 +0000
Subject: [PATCH] Fix Notice. When nothing exists for an action or filter.

git-svn-id: https://develop.svn.wordpress.org/trunk@9000 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/plugin.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-includes/plugin.php b/wp-includes/plugin.php
index 0522d5433e..dc7dfe6812 100644
--- a/wp-includes/plugin.php
+++ b/wp-includes/plugin.php
@@ -658,7 +658,7 @@ function _wp_filter_build_unique_id($tag, $function, $priority) {
 		if ( !isset($function[0]->wp_filter_id) ) {
 			if ( false === $priority )
 				return false;
-			$count = count((array)$wp_filter[$tag][$priority]);
+			$count = isset($wp_filter[$tag]) ? count((array)$wp_filter[$tag][$priority]) : 0;
 			$function[0]->wp_filter_id = $count;
 			$obj_idx .= $count;
 			unset($count);