Admob GADBannerView.m bool _WebTryThreadLock(bool) iOS iPhone crash

I running the app on iPhone 3.1.3 (first gen iPhone) with admob sdk. Thought not all the time, I started to get this error lately, which I never seen before.

<Warning>: bool _WebTryThreadLock(bool), 0x3c3840: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...

and then when I trac开发者_Python百科e the error down in the log file, I see

Thread 6 Crashed:
0   WebCore                         0x00084380 _WebTryThreadLock(bool) + 288
1   WebCore                         0x00084ac0 _WebThreadAutoLock() + 52
2   UIKit                           0x0022061c -[UIWebView dealloc] + 128
3   CoreFoundation                  0x0003963a -[NSObject release] + 28
4   UIKit                           0x0000ab2c -[UIView(Hierarchy) removeFromSuperview] + 592
5   UIKit                           0x0005ca1c -[UIView dealloc] + 232
6   My iPhone App                       0x0008d4e0 0x1000 + 574688
7   CoreFoundation                  0x0003963a -[NSObject release] + 28
8   UIKit                           0x0000ab2c -[UIView(Hierarchy) removeFromSuperview] + 592
9   UIKit                           0x0005ca1c -[UIView dealloc] + 232
10  CoreFoundation                  0x0003963a -[NSObject release] + 28
11  UIKit                           0x000cad5c -[UIViewController dealloc] + 188
12  My iPhone App                       0x00015e60 0x1000 + 85600
13  My iPhone App                       0x000135c4 0x1000 + 75204

and traced it down even further and got,

-[GADBannerView dealloc] (in My iPhone App) (GADBannerView.m:111)

-[myViewController dealloc] (in My iPhone App) (myViewController.m:378)

-[mySubViewController dealloc] (in My iPhone App) (mySubViewController.m:64)

I have no idea what's going on. Is there something I can do to prevent the crash or is this something admob has to fix?

Any help is apprecated

Try debugger to get the idea where your error occurred. Also from where you are calling removeFromSuperView method. This might be causing the problem