From e03782efddf11b05d044f9a27f86bf5693e82b45 Mon Sep 17 00:00:00 2001
From: Sam Hemelryk <sam@moodle.com>
Date: Fri, 21 Dec 2012 10:50:07 +1300
Subject: [PATCH] MDL-37263 cache: fixed event invalidation coding error

---
 cache/classes/loaders.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cache/classes/loaders.php b/cache/classes/loaders.php
index 74014c417b0..028a31e18a0 100644
--- a/cache/classes/loaders.php
+++ b/cache/classes/loaders.php
@@ -1093,6 +1093,10 @@ class cache_application extends cache implements cache_loader_with_locking {
             $todelete = array();
             // Iterate the returned data for the events.
             foreach ($events as $event => $keys) {
+                if ($keys === false) {
+                    // There are no keys.
+                    continue;
+                }
                 // Look at each key and check the timestamp.
                 foreach ($keys as $key => $timestamp) {
                     // If the timestamp of the event is more than or equal to the last invalidation (happened between the last