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    copied!<p>I'm seeing something similar - both while freeing a webview after loading a PDF or while loading html after loading a PDF. It appears to be rdar://10431759 (see <a href="http://openradar.appspot.com/10431759" rel="noreferrer">http://openradar.appspot.com/10431759</a> ). I don't have a way to work around it. I can reproduce it by loading a pdf and then loading the html string <code>@"&lt;div&gt;&lt;/div&gt;"</code>, so it doesn't appear to be a delegate issue.</p> <p>If you type "bt" into the gdb console, you may get the real stacktrace, including:</p> <pre><code>#0 0x37ccd1c8 in objc_exception_throw () #1 0x381817b8 in +[NSException raise:format:arguments:] () #2 0x381817b8 in +[NSException raise:format:arguments:] () #3 0x381817da in +[NSException raise:format:] () #4 0x35462628 in -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] () #5 0x35462296 in -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] () #6 0x31fc3448 in -[UIWebPDFView _removeBackgroundImageObserverIfNeeded:] () #7 0x31fc36a8 in -[UIWebPDFView dealloc] () #8 0x37cc90c4 in _objc_rootRelease () #9 0x31dd2614 in -[UIWebPDFViewHandler clearAllViews] () #10 0x31d76708 in -[UIWebPDFViewHandler _replacePDFViewIfPresentWithWebDocView:] () #11 0x31d766a6 in -[UIWebPDFViewHandler _removePDFViewIfWebDocViewIsNotPDF:] () #12 0x31d76644 in -[UIWebBrowserView webView:didFirstVisuallyNonEmptyLayoutInFrame:] () </code></pre> <p>When debugging on the device, you can type "frame 0" and "po $r0" to see the exception message: (I think it's "po $eax" in the simulator.)</p> <pre><code>(gdb) frame 0 #0 0x37ccd1c8 in objc_exception_throw () (gdb) po $r0 Cannot remove an observer &lt;UIWebPDFView 0x4a3200&gt; for the key path "backgroundImage" from &lt;UIPDFPageView 0x4a4bf0&gt; because it is not registered as an observer. </code></pre> <p><strong>Edit:</strong> This problem only seems to occur when I have "Break on throw" turned on for Objective-C exceptions.</p>
 

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