Avril Lavigne's Ex Deryck Whibley — Chris Paul's House is HAUNTED

There”s a reason L.A. Clippers star Chris Paul got a sick deal on his giant Bel Air mansion — according to Avril Lavigne“s ex-husband Deryck Whibley … the place has a bad ghost problem.

broke the story … Avril sold Chris the 8-bedroom palace for $8.5 million — one million less than her original listing price.

But according to Whibley — who used to live in the house with Avril — the discount was no coincidence … telling us, the mansion is “haunted.”

Color us skeptical — but the Clippers did lose to the Lakers last night … coincidence