diff --git a/index.php b/index.php
index 85d7588fad82a1d94e670bcaaf00c35d87003840..61e2de0d6bd2f74edac3d3f165a39b1fa6f61510 100644
--- a/index.php
+++ b/index.php
@@ -227,12 +227,6 @@ WIN: [ Alt ] + [ c ]" accesskey="c" onclick="copyOutput()">Copy output field [c]
     </div>
   </main>
   <script>
-    // Error messages dialog
-    const dialog = document.getElementById("dialog");
-    const closeButtonDialog = document.querySelector("dialog button");
-    closeButtonDialog.addEventListener("click", () => {
-      dialog.close();
-    });
     // disable form for input file
     checkInputFile();
     checkOutputFile();