diff --git a/includes/rules.state.inc b/includes/rules.state.inc
index 2e716b2..4cbeac5 100644
--- a/includes/rules.state.inc
+++ b/includes/rules.state.inc
@@ -608,11 +608,14 @@ class RulesData  {
    * @see RulesPlugin::availableVariables()
    */
   public static function addSiteMetadata(EntityMetadataWrapper $wrapper, $property_info) {
-    $site_info = entity_get_property_info('site');
-    $property_info['properties'] += $site_info['properties'];
-    // Also invoke the usual callback for altering metadata, in case actions
-    // have specified further metadata.
-    return RulesData::applyMetadataAssertions($wrapper, $property_info);
+    if ($site_info = entity_get_property_info('site')) {
+      $property_info['properties'] += $site_info['properties'];
+      // Also invoke the usual callback for altering metadata, in case actions
+      // have specified further metadata.
+      return RulesData::applyMetadataAssertions($wrapper, $property_info);
+    }else{
+      return FALSE;
+    }
   }
 }