diff --git a/js/piwik.js b/js/piwik.js
index 0d8084cecf6..5f7ac95c4a4 100644
--- a/js/piwik.js
+++ b/js/piwik.js
@@ -2176,7 +2176,7 @@ if (typeof window.Matomo !== 'object') {
                 return true;
             }
 
-            if (isDefined(frameElement)) {
+            if (frameElement !== null && isDefined(frameElement)) {
                 return (frameElement && String(frameElement.nodeName).toLowerCase() === 'iframe') ? true : false;
             }