diff --git a/src/conversejs/converse.js b/src/conversejs/converse.js
index c700d4845687280164cb1c1fec2470e67863ae78..3c5384270fbb527134030b33d6416d0c3d58cf69 100644
--- a/src/conversejs/converse.js
+++ b/src/conversejs/converse.js
@@ -78330,7 +78330,7 @@ const MessageMixin = {
     xhr.setRequestHeader('Content-type', this.file.type);
 
     // Add custom headers to request
-    this.get('headers')?.forEach(header => {
+    this.get('headers').forEach(header => {
       xhr.setRequestHeader(header.getAttribute('name'), header.innerHTML);
     });