diff --git a/js/reiseauskunft.js b/js/reiseauskunft.js
index 760b157..b58c796 100644
--- a/js/reiseauskunft.js
+++ b/js/reiseauskunft.js
@@ -7,7 +7,6 @@ function getMediaURL(path) {
   return chrome.runtime.getURL(path) || browser.runtime.getURL(path);
 }
 
-var target = document.getElementById('resultsOverview');
 
 var observer = new MutationObserver((mutations, observer) => {
     mutations.forEach((mutation) => {
@@ -31,7 +30,12 @@ var observer = new MutationObserver((mutations, observer) => {
     });
 });
 
-observer.observe(target, {
-  subtree: true,
-  childList: true
-});
+
+var target = document.getElementById('resultsOverview');
+
+if(typeof target !== 'undefined') {
+  observer.observe(target, {
+    subtree: true,
+    childList: true
+  });
+}