diff --git a/js/reiseauskunft.js b/js/reiseauskunft.js
index cbe0109..99fb400 100644
--- a/js/reiseauskunft.js
+++ b/js/reiseauskunft.js
@@ -6,12 +6,15 @@ function getMediaURL(path) {
   path = "media/" + path;
   return chrome.runtime.getURL(path) || browser.runtime.getURL(path);
 }
+
 /**
   * Return train name in format "PRODUCT TRAIN_NUMER"
   * i.e. "ICE 112", "RE 12734"
   * Sometimes train name is in format "PRODUCT LINE_NUMER (TRAIN_NUMER)"
   * i.e. "STB 12 (62371)"
-  * this will be cleaned up
+  * Sometimes 'trains' are not trains or we can't find an unique id for them
+  * i.e. busses, ferrys, trams
+  * they will also be cleaned up and returned as undefined, because we can't link to them correctly
   */
 function bahnParseTrainName(dirty_train_name) {
   var name_list = dirty_train_name.split(" ");
@@ -21,6 +24,11 @@ function bahnParseTrainName(dirty_train_name) {
     return name_list[0] + " " + name_list[2].substring(1, name_list[2].length-1);
   }
 
+  // Exclude linking to specific products
+  if(["bus", "fäh", "str"].indexOf(name_list[0].toLowerCase()) !== -1) {
+    return undefined;
+  }
+
   return dirty_train_name;
 }
 
@@ -33,7 +41,9 @@ var observer = new MutationObserver((mutations, observer) => {
           var products = timetable.querySelectorAll("tr.first td.products");
           products.forEach((product) => {
             var train_name = bahnParseTrainName(product.querySelector("span a").innerText);
-            product.innerHTML = product.innerHTML + ' <a href="https://marudor.de/details/' + train_name + '" target="_blank"><img src="' + getMediaURL("marudor.svg") + '" style="height: 2em; vertical-align:middle;"></a>';
+            if(typeof train_name !== 'undefined') {
+              product.innerHTML = product.innerHTML + ' <a href="https://marudor.de/details/' + train_name + '" target="_blank"><img src="' + getMediaURL("marudor.svg") + '" style="height: 2em; vertical-align:middle;"></a>';
+            }
           });
           var stations = timetable.querySelectorAll("tr td.station");
           stations.forEach((station) => {