Apple is offering free replacement for MagSafe power adapters with separation of the white insulation. According to Apple’s knowledge base article, “Whether your product is in or out-of-warranty, you can take your adapter (you don’t need to take the computer) to an Apple-Authorized Service Provider”. Some MacBook and MacBook Pro models are affected.
If you have problems with your MagSafe adapter then contact the Apple dealer that you bought your MacBook from. Or contact Arab Computers, Apple’s Distributor in Saudi Arabia.