How to determine if the player REjoined the room?

Hi to all!

For example:
Disconnected players in my game are replaced with bots.
After player has rejoined the room the OnJoin() callback is called and I have to replace one of the bots with a player.
But if this is a new player who has just joined the room the OnJoin() callback is also called but I dont have to do anything.
So the question: is the a way to figure out if this is a join or REjoin?

P.S. I'm sorry for my English!

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