The 'momager', 60, told Keeping Up With The Kardashians fans that Rob would like to return to the reality show… When he is "feeling better".
Rob, 28, has been living a life of relative seclusion for several years in comparison to his enormously famous family.
And reports blame his obesity and his recent diabetes diagnosis. The family even had to deny recent rumours that they were planning an intervention.
Now, matriarchal Kris has revealed he hasn't been around much because of his health.
During Thursday night's (14 January) Architects of Change: The Conversation Series event, she told journalist Maria Shriver he's been feeling depressed and needed time out.
She says: "He's had a year where he kind of wanted to chill. He hasn't been feeling well, we didn't know why. He was just diagnosed with diabetes, so we're taking care of that. But he's always around. I see Rob every day."
Contradicting persistent rumours of a family feud, Kris added: "I think Rob enjoys all the family stuff we do. He has his business, his sock line and his stuff. But I think that it was just the perfect time for him to take like a little hiatus. We said, 'Just get well. Feel better.' He was depressed and just wasn't feeling good and didn't know why."
When asked why Rob doesn't appear on the show, even though he is "around all the time", Kris responded: "He wants to still come back and shoot the show, he just wants to feel good. It's not that he doesn't want to be on the show, it's just he wasn't feeling good."
Rob hasn't physically appeared in KUWTK since June 2013.
He was rushed to hospital between Christmas and the New Year with stomach pains and subsequently diagnosed with type 2 diabetes.
Radar Online recently reported that Kris wants Rob to have gastric bypass or gastric banding surgery.
Just days ago, reality show fans saw big sister Kim make a jibe about Rob's weight in KUWTK footage. However, Kim's quip was filmed BEFORE his diabetes diagnosis.
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