diff --git a/lib/devtools.js b/lib/devtools.js
index e244f53..5d29963 100644
--- a/lib/devtools.js
+++ b/lib/devtools.js
@@ -304,8 +304,8 @@ customElements.define('developer-tooling', class extends HTMLElement {
       this.render()
     })
     inspectorSession.on('info', ({ filename }) => {
-      app.url = filename
-      app.title = filename.split('/').pop()
+      app.url = filename || 'untitled'
+      app.title = filename?.split('/').pop() || 'untitled'
       this.apps.set(sessionId, app)
       this.render()
     })