diff --git a/popup/popup.js b/popup/popup.js
index 6bba06f4..6b90bfb9 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -105,19 +105,20 @@ function initPopup(url) {
       installed);
   }
 
-  const u = new URL(url);
-  $('#find-styles-link').onclick = handleEvent.openURLandHide;
-  $('#find-styles-link').href +=
-    url.startsWith(location.protocol) ? '?search_terms=Stylus' :
-    u.protocol === 'file:' ? 'file:' :
-    u.hostname.replace(/^www\.|(\.com?)?\.\w+$/g, '').split('.').pop();
-
   if (!url) {
     document.body.classList.add('blocked');
     document.body.insertBefore(template.unavailableInfo, document.body.firstChild);
     return;
   }
 
+  const u = tryCatch(() => new URL(url));
+  $('#find-styles-link').onclick = handleEvent.openURLandHide;
+  $('#find-styles-link').href +=
+    !u ? '' :
+    u.protocol === 'file:' ? 'file:' :
+    u.protocol === location.protocol ? '?search_terms=Stylus' :
+    u.hostname.replace(/^www\.|(\.com?)?\.\w+$/g, '').split('.').pop();
+
   getActiveTab().then(function ping(tab, retryCountdown = 10) {
     sendMessage({tabId: tab.id, method: 'ping', frameId: 0}, pong => {
       if (pong) {