diff --git a/lib/activity.php b/lib/activity.php
index 5b304020d6..8546b474d2 100644
--- a/lib/activity.php
+++ b/lib/activity.php
@@ -347,6 +347,11 @@ class ActivityUtils
         $els = $element->childNodes;
 
         foreach ($els as $link) {
+
+            if (!($link instanceof DOMElement)) {
+                continue;
+            }
+
             if ($link->localName == self::LINK && $link->namespaceURI == self::ATOM) {
 
                 $linkRel = $link->getAttribute(self::REL);