Judge Mathis is weighing in on Kim Kardashian and Kris Jenner's defamation lawsuit against Ray J, saying the sex tape -- and all the money they made off it -- makes it tough to sue him now.

Judge Mathis is weighing in on Kim Kardashian and Kris Jenner suing Ray J for defamation ... and he’s basically telling us he doesn’t see what their case even is.

*If you’re a fan of “Judge Mathis” and “The People’s Court,” we’ve got some devastating news for you. Unfortunately, both courtroom shows are on the docket to be canceled after the end of their 24th ...