diff --git a/app/soapbox/features/ui/util/pending_status_builder.js b/app/soapbox/features/ui/util/pending_status_builder.js
index fcb41c14f..6b55e4b7b 100644
--- a/app/soapbox/features/ui/util/pending_status_builder.js
+++ b/app/soapbox/features/ui/util/pending_status_builder.js
@@ -16,7 +16,7 @@ export const buildStatus = (state, pendingStatus, idempotencyKey) => {
     const inReplyTo = getStatus(state, { id: pendingStatus.get('in_reply_to_id') });
 
     if (inReplyTo.getIn(['account', 'id']) === me) {
-      mentions = ImmutableOrderedSet([account.get('acct')]).union(pendingStatus.get('to', []));
+      mentions = ImmutableOrderedSet([account.get('acct')]).union(pendingStatus.get('to') || []);
     } else {
       mentions = pendingStatus.get('to', []);
     }