diff --git a/zundler/assets/init.js b/zundler/assets/init.js
index 36535f2..eee3b35 100644
--- a/zundler/assets/init.js
+++ b/zundler/assets/init.js
@@ -24,6 +24,7 @@ var _base64ToArrayBuffer = function (base64) {
 
 
 var set_favicon = function(href) {
+    if (!href) {return;}
     var favicon = document.createElement("link");
     favicon.setAttribute('rel', 'shortcut icon');
     href = normalize_path(href);
diff --git a/zundler/assets/inject.js b/zundler/assets/inject.js
index 6594869..2a4468e 100644
--- a/zundler/assets/inject.js
+++ b/zundler/assets/inject.js
@@ -231,10 +231,15 @@ const observer = new MutationObserver((mutationList) => {
 
 
 // Set parent window title and trigger data transmission
+var favicon = window.document.querySelector("link[rel*='icon']");
+if (favicon) { favicon = favicon.getAttribute('href'); }
+var title = window.document.querySelector('head>title');
+if (title) { title = title.innerText; }
+
 window.parent.postMessage({
     action: "set_title",
     argument: {
-        title: window.document.querySelector('head>title').innerText,
-        favicon: document.querySelector("link[rel*='icon']").getAttribute('href')
+        title: title,
+        favicon: favicon
     }
 }, '*');