packages/moxxmpp/lib/src/xeps/xep_0384/xep_0384.dart

@@ -459,15 +459,9 @@ abstract class BaseOmemoManager extends XmppManagerBase {
         );
       }
 
-      final envelopeChildren = envelope.firstTag('content')?.children;
+      children.addAll(
-      if (envelopeChildren != null) {
+        envelope.firstTag('content')!.children,
-        children.addAll(
+      );
-          // Do not add forbidden elements from the envelope 
-          envelopeChildren.where(shouldEncryptElement),
-        );
-      } else {
-        logger.warning('Invalid envelope element: No <content /> element');
-      }
 
       if (!checkAffixElements(envelope, stanza.from!, ourJid)) {
         other['encryption_error'] = InvalidAffixElementsException();