backfill: fix NPE if no messages found

Signed-off-by: Sumner Evans <sumner.evans@automattic.com>
2025-03-13 11:58:18 -06:00
parent 854f66cb04
commit 09b1e69c0f
1 changed files with 3 additions and 1 deletions
@@ -254,7 +254,9 @@ func (t *TelegramClient) FetchMessages(ctx context.Context, fetchParams bridgev2

 	// If the first message is the last read message, mark the chat as read
 	// during backfill.
-	markRead := fetchParams.Forward && portal.Metadata.(*PortalMetadata).ReadUpTo == messages[0].GetID()
+	markRead := fetchParams.Forward &&
+		len(messages) > 0 &&
+		portal.Metadata.(*PortalMetadata).ReadUpTo == messages[0].GetID()

 	var cursor networkid.PaginationCursor
 	if len(messages) > 0 {