fix #63 error from MAF Norge

CRM/Civirules/Utils/CustomDataFromPre.php

@@ -5,11 +5,13 @@ class CRM_Civirules_Utils_CustomDataFromPre {
   private static $customValues = array();
 
   public static function pre($op, $objectName, $objectId, $params) {
-    if (isset($params['custom']) && is_array($params['custom'])) {
-      foreach($params['custom'] as $fid => $custom_values) {
-        foreach($custom_values as $id => $field) {
-          $value = $field['value'];
-          self::setCustomData($objectName, $fid, $value, $id);
+    if (is_array($params)) {
+      if (isset($params['custom']) && is_array($params['custom'])) {
+        foreach ($params['custom'] as $fid => $custom_values) {
+          foreach ($custom_values as $id => $field) {
+            $value = $field['value'];
+            self::setCustomData($objectName, $fid, $value, $id);
+          }
         }
       }
     }