The Big Bang Theory Season 10 might be the last for the hit comedy show should the demand of the cast not be met.

The contract of the main cast are all up at the end of Season 10. Jim Parsons, Johnny Galecki, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik and Melissa Rauch have yet to sign their new contracts. Rumors indicated that they are asking for a pay raise from the contracts they signed two years ago.

Currently, Parsons (Sheldon), Galecki (Leonard) and Cuoco (Penny) are earning $1 million each per episode. Helberg (Howard) and Nayyar’s (Raj) income is around $750,000 each per episode through Season 10. Bialik (Amy) and Rauch (Bernadette), on the other hand, renegotiated their contracts back in 2013. At the time, Deadline reported that the actresses were able to close a $60,000 per episode deal in Season 7. Their contracts also have a condition that their pay will steadily increase every year, so it already reached almost $100,000.

The Big Bang Theory showrunner Steve Molaro refused to entertain the possibility that one of his main cast members will quit the show. He admitted though that the sitcom will be different and weird if one member of the gang decides not to renew his or her contract.

Molaro told The Hollywood Reporter that all they can do now is to focus on filming. “As far as I’m concerned, here in the writers’ room, it’s business as usual: moving forward with the characters and letting them live their lives day by day and feeling out what happens with them,” he said.

The current round of salary negotiation with the cast is far from what transpired two years ago. In 2014, the production of The Big Bang Theory has been put on hold until the cast signed their contracts. This time around, TBBT’s filming is going smoothly. As proof, the cast already shared some photos from the set.

Always happy to have a scene with @therealjimparsons

A post shared by mayim bialik (@missmayim) on

On the ever bigger question if we can expect a Sheldon-Amy wedding this season, Molaro hinted there might be none. However, he did not discard any possibility that the couple will tie the knot in the future. We can’t expect new roommate agreements in Season 10, but it doesn’t mean there will be no engagement.

The Big Bang Theory Season 10 returns on September 19 at 8 p.m. on CBS. It will be back on its regular timeslot after the NFL coverage on Oct. 27.

Stay tuned here to find if the Big Bang Theory Season 10 cast will sign new contracts.