Index: sites/all/modules/contrib/rules/rules.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- sites/all/modules/contrib/rules/rules.module	(revision )
+++ sites/all/modules/contrib/rules/rules.module	(revision )
@@ -333,7 +333,9 @@
     }
     elseif (strpos($cid, 'event_') === 0) {
       $cache[$cid] = FALSE;
+      if (class_exists('RulesEventSet')) {
-      RulesEventSet::rebuildEventCache();
+        RulesEventSet::rebuildEventCache();
+      }
     }
     else {
       $cache[$cid] = FALSE;