On 4 Mar 2011, at 22:20, Banlu Kemiyatorn wrote:

> When NSOperation finish in -_finish
> it didChangeValueForKey:@"isFinished" (525)
> in NSKeyValueObserving.m:1739 it [pathInfo notifyForKey: aKey
> ofInstance: [info instance] prior: NO];
> which make it be removed from the op queue and deallocated at 
> NSOperation.m:902
> and crash at NSKeyValueObserving.m:1748
> 
> should retaining and releasing self around _finish?

Thanks ... I implemented that suggestion.
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