diff --git a/src/conversejs/converse.js b/src/conversejs/converse.js
index 2b95ef73f765c8ffdfc0b033341261fa31e58ab2..1063c0f2fd7ac143f3bc7211e1204aeb37f1d0fe 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);
     });