diff --git a/lib/ruby_ui/dialog/dialog_controller.js b/lib/ruby_ui/dialog/dialog_controller.js
index 03692435..26bf1fa0 100644
--- a/lib/ruby_ui/dialog/dialog_controller.js
+++ b/lib/ruby_ui/dialog/dialog_controller.js
@@ -17,7 +17,7 @@ export default class extends Controller {
   }
 
   open(e) {
-    e.preventDefault()
+    e?.preventDefault();
     document.body.insertAdjacentHTML('beforeend', this.contentTarget.innerHTML)
     // prevent scroll on body
     document.body.classList.add('overflow-hidden')