Support Whatsapp causes Galaxy Ace contacts to crash

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http://androidforums.com – Hi, On Samsung Galaxy Ace (model GT-S5830i), Android version 2.3.6, when I install WhatsApp, the WhatsApp application works ok. But the PHONE's contact's crash. The situation is that when I try to call someone, I go to the phone icon, contacts, look for my contact, when I tap it's name...the phone freezes for for a phone seconds, then it says "Android.process.acore" crashed. This happens for some of the contacts, not all of them. When I remove Whatsapp, everything is back to normal. Contacts are visible and I can call them. Thanks, itaymen. (General)