diff --git a/plugins/cache/simple.inc b/plugins/cache/simple.inc
index 916df42..6129b6c 100644
--- a/plugins/cache/simple.inc
+++ b/plugins/cache/simple.inc
@@ -104,7 +104,7 @@ function panels_simple_cache_get_id($conf, $display, $args, $contexts, $pane) {
     $id .= ':' . $language->language;
   }
   
-  if($pane->configuration['use_pager'] == 1) {
+  if(isset($pane->configuration['use_pager']) && $pane->configuration['use_pager'] == 1) {
     $id .= ':p' . check_plain($_GET['page']);
   }