They say keep your friends close and your enemies closer, but maybe Rob and Chyna should keep their friends a little further away?

Over the weekend, the safe in Blac Chyna's Tarzana home was broken into and a shocking amount of cash was stolen -- $200,000 in fact. In addition to the cash, a number of pieces of jewelry were also stolen, according to TMZ.

The outlet is reporting that her fiance Rob Kardashian was the one who noticed the theft and called the police.

The site is also reporting that the couple believes that a friend of theirs is the one with the sticky fingers. Ouch!

A source told the publication, "Signs point to the culprit being someone close to her and Rob."

Law enforcement official say that there was no "obvious sings of entry" and that the safe was not "busted open" -- which makes it sound like an inside job by someone int he "inner circle."

Rob has been living with Tyga's baby mama ever since his sister Khloe kicked him out of her home.