How many times can a player pass their turn on Scrabble?

I'm playing online Scrabble and am supposed to win, scores are very close. I have 3 tiles left but nowhere to put on board. The other player has 1 chip left but passed it back to me twice so far and I passed it back. How's this supposed to end?|||Sounds like you are playing on ISC. 4 consecutive passes ends a game. the value of tiles on your rack is deducted from your current score, as is your opponent's. The could result in a loss fro you.|||If y'all both pass games over