Shervin Roohparvar is sliding toward trouble, because a crappy zip line caused a woman to fall and break her back ... so she says in a new lawsuit.
A California woman claims the "Shahs of Sunset" star and his friend, Nima Nejat, didn't take the proper precautions to keep her from falling from a pool's upper deck -- where the zip line originated.
Shervin and Nima don't own the property, but the suit claims they're the ones living there so they're responsible for not warning of the dangers.
The injured woman claims the fall knocked her unconscious, gave her a concussion, fractured her vertebrae and will result in permanent disability.
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