diff --git a/core/components/quip/model/quip/quipcomment.class.php b/core/components/quip/model/quip/quipcomment.class.php
index fe00b77..23ebf92 100644
--- a/core/components/quip/model/quip/quipcomment.class.php
+++ b/core/components/quip/model/quip/quipcomment.class.php
@@ -108,6 +108,7 @@ public function makeUrl($resource = 0,$params = array(),$options = array(),$addA
             $options['context_key'] = $this->get('context_key');
             if (empty($options['context_key'])) {
                 $modresource = $this->xpdo->getObject('modResource', $resource);
+                if (!$modresource) return "Javascript: alert('Commeted object is lost! You can delete this comment.')";
                 $options['context_key'] = $modresource->get('context_key');
             }
         }
@@ -512,4 +513,4 @@ public function prepare(array $properties = array(),$idx) {
         }
         return $commentArray;
     }
-}
\ No newline at end of file
+}