Lindsay Lohan Attempts Intervention -- And NOT for Her

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Lindsay Lohan is trying to live by the adage, "Do what you know," and she knows how to party ... but apparently not well enough to save a good friend.

We're told Lindsay tried to stage an intervention for hotel magnate/BFF Vikram Chatwal, who was arrested at the Ft. Lauderdale Airport for possession of heroin, cocaine, weed and Rx pills.

Chatwal owns the Dream Hotel in NYC, where Lindsay has frequently stayed and partied. We're told Chatwal has comped her when she's there.

Sources say Lindsay tried to return the favor in 2012 by surprising Vikram at the Chateau Marmont Hotel in West Hollywood. The plan was ... when he walked in the room, a bunch of friends and family would be there to express their grave concern over his drug use and partying.

It's unclear why ... but the intervention never took place, and Vikram kept partying, right until he was busted.

Let's get serious. Lindsay never stopped partying either.