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POMapKit exception: Cannot remove an observer for the key path "title"
 

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    <p>I'm getting quite a lot of crashes like this. In my code, I'm not doing any KVO on my MKAnnotation objects that could explain this exception. So to me, it looks like an iOS bug.</p> <p>Did anybody else experience similar crashes?</p> <pre><code>*** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer for the key path "title" from because it is not registered as an observer.' Thread 0 Crashed: 0 libSystem.B.dylib 0x000792d4 __kill + 8 1 libSystem.B.dylib 0x000792bd raise + 17 2 WhereTo 0x000a430d uncaught_exception_handler (PLCrashReporter.m:137) 3 CoreFoundation 0x000a0adf __handleUncaughtException + 239 4 libobjc.A.dylib 0x00006593 _objc_terminate + 103 5 libstdc++.6.dylib 0x00042df9 __cxxabiv1::__terminate(void (*)()) + 53 6 libstdc++.6.dylib 0x00042e4d std::terminate() + 17 7 libstdc++.6.dylib 0x00042f1d __cxa_throw + 85 8 libobjc.A.dylib 0x000054cb objc_exception_throw + 71 9 CoreFoundation 0x000a07c9 +[NSException raise:format:arguments:] + 69 10 CoreFoundation 0x000a0803 +[NSException raise:format:] + 35 11 Foundation 0x00031b4d -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 545 12 Foundation 0x000318a1 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 121 13 MapKit 0x00024e75 -[MKAnnotationContainerView _unregisterObserverForBubbleAnnotation:] + 133 14 MapKit 0x0001fd29 -[MKAnnotationContainerView setBubbleAnnotationView:] + 73 15 MapKit 0x0001f4e3 -[MKAnnotationContainerView _showBubbleForAnnotationView:bounce:scrollToFit:userInitiated:avoid:] + 211 16 MapKit 0x0001f235 -[MKAnnotationContainerView _setSelectedAnnotationView:bounce:pressed:scrollToFit:userInitiated:avoid:] + 357 17 MapKit 0x0001f0bf -[MKAnnotationContainerView _setSelectedAnnotationView:bounce:pressed:scrollToFit:userInitiated:] + 83 18 MapKit 0x000248ab -[MKMapView handleTap:] + 195 19 CoreFoundation 0x0003ebbf -[NSObject(NSObject) performSelector:withObject:] + 23 20 UIKit 0x0009a3d3 -[UIGestureRecognizer _updateGestureWithEvent:] + 575 21 UIKit 0x0009a18b -[UIGestureRecognizer _delayedUpdateGesture] + 23 22 UIKit 0x000017b1 _UIGestureRecognizerUpdateObserver + 437 23 CoreFoundation 0x00030c59 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 17 24 CoreFoundation 0x00030acd __CFRunLoopDoObservers + 413 25 CoreFoundation 0x000280cb __CFRunLoopRun + 855 26 CoreFoundation 0x00027c87 CFRunLoopRunSpecific + 231 27 CoreFoundation 0x00027b8f CFRunLoopRunInMode + 59 28 GraphicsServices 0x000044ab GSEventRunModal + 115 29 GraphicsServices 0x00004557 GSEventRun + 63 30 UIKit 0x00037329 -[UIApplication _run] + 413 31 UIKit 0x00034e93 UIApplicationMain + 671 32 WhereTo 0x00003475 main (main.m:14) </code></pre>
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    1. USOrtwin Gentz
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    1. COAre you doing anything special like subclassing MKAnnotation? Are you displaying the user location when this happens? Are you returning nil when returning the MKAnnotationView for userLocation? Sorry for all the questions, hard to diagnose though.
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    2. CO@Rudiger, my class is defined as `@interface FTPlacemark : MKPlacemark <MKAnnotation, NSCoding>`. Generally, the user location is displayed. I can't reproduce the issue yet, so don't know if the user location is visible when it happens. Of course, I'm returning nil for the userLocation. How do you come to your suspicion of the userLocation view being the problem?
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    3. COJust remember when I stuffed up my class and ended up returning something other than nil for user location I got a strange error which was from memory a KVO error. I have used MapKit a lot and have never found a bug in MKAnnotation. Then again I have not used MKPlacemark yet
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