ios:EXC_BAD_ACCESS for Webview delegate

I have a situation where I am trying to resolve these Crashlytics issues and I have this crash log

Thread : Crashed: com.apple.main-thread 0 libobjc.A.dylib 0x34217f46 objc_msgSend + 5 1 UIKit 0x29a2d5a3 -[UIWebView webView:decidePolicyForNavigationAction:request:frame:decisionListener:] + 182 2 CoreFoundation 0x2630cad4 __invoking___ + 68 3 CoreFoundation 0x26239645 -[NSInvocation invoke] + 300 4 CoreFoundation 0x2623d0c7 -[NSInvocation invokeWithTarget:] + 50 5 WebKitLegacy 0x326d9261 -[_WebSafeForwarder forwardInvocation:] + 224 6 CoreFoundation 0x2630b62f ___forwarding___ + 354 7 CoreFoundation 0x2623d008 _CF_forwarding_prep_0 + 24 8 CoreFoundation 0x2630cad4 __invoking___ + 68 9 CoreFoundation 0x26239645 -[NSInvocation invoke] + 300 10 WebCore 0x31c02729 HandleDelegateSource(void*) + 100 11 CoreFoundation 0x262cefbf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14 12 CoreFoundation 0x262ce461 __CFRunLoopDoSources0 + 364 13 CoreFoundation 0x262cca35 __CFRunLoopRun + 772 14 CoreFoundation 0x2621a3b1 CFRunLoopRunSpecific + 476 15 CoreFoundation 0x2621a1c3 CFRunLoopRunInMode + 106 16 GraphicsServices 0x2d801201 GSEventRunModal + 136 17 UIKit 0x2988443d UIApplicationMain + 1440 18 abc 0x0030dcd7 main (main.m:14)

I can understand that its some callback on webview delegate and bad excess has occurred, so to rectify this I handled the delegates via

[self.webview stopLoading];
self.webview.delegate =nil;

in all the classes, yet I can see this crash. Can you Please enlighten me whats possibly going wrong and some approach to rectify this.

looking forward for your response.

Thanks Ankit