3rd player stuck on joining on a SRB2Kart local server

If your wondering, I'm doing this 100% local, not some app that can play with friends far away. But I can't join. When a 3rd player joined the server, the player can't join when pressing the join button. Any fix? The host (first player) and the second player can join. I waited for a while, and still happening.

You can't join a race seconds after the race has started (provided the current race has at least 2 non-spectator players).
Restarting the race or finishing it and having the game change to the next map will allow whoever's pending to join to enter the race.

Thanks for the advice! (Now Closed)