Blac Chyna and Kris Jenner rushed to an emergency room Wednesday night after someone in the family experienced a medical emergency ... TMZ has learned.
Chyna and Kris arrived separately -- Kris was with Corey Gamble -- and rushed into the ER at 9:45 PM near Hidden Hills, where the family lives.
We're told whoever they went to see was already being treated in the ER. Chyna did not arrive with Dream, so it would appear the baby did not have a medical emergency.
We're hearing the person who was in medical distress is Rob Kardashian, who is currently living separately from Chyna. Rob and the baby are what bind Kris and Chyna together ... otherwise they haven't gotten along as of late. BTW ... Chyna and Rob were not at Kris' Christmas party earlier this week.
As for Rob, as TMZ has reported, he's suffered from diabetes.
7:47 AM PT -- Family sources tell TMZ Rob checked himself into the hospital because his diabetes flared up. We're told he had been doing ok lately but the stress from his turbulent relationship with Blac Chyna drove him to eat excessively and he gained an alarming amount of weight recently ... causing him to lose control over his diabetes.
He's still in the hospital as doctors try to stabilize him.