App began to crash on iOS 9.1 Beta 2

Question

The application began to crash when installing on iOS 9.1 Beta 2. Exactly same binary (downloaded from hudson link) behaves so:

• It did not crash on iOS 9.0 and iOS 9.0.1
• It did not crash on either iOS 8

I have extracted the crash log, crash happens inside the call to [[NSBundle mainBundle] loadNibNamed:@"NameOfView" owner:self options:nil];. The crash itself is NSUnknownKeyException:

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[< NameOfView: 0x1446a6ea0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key .'

So far i see weird key '.' which nib loading mechanism tries to set on my class, and obviously, such is not present in nib. And this looks extraweird even more, due to iOS 9.1 beta 2 is the only version with this behaviour. Moreover, building app with XCode 7 from on same git revision gives no success crashing app - it works as expected. Has anybody experienced such behaviour after trying your release versions on iOS 9.0.1 beta 2? Want to have some feedbacks of SO community before file a bug to radar. Appreciate your help, guys.

P.S. I'd like to emphasize that the issue reproduces only on that particular binary. Building it again from the same sources in XCode 7 doesn't produce a crash. So please, don't suggest how to debug such kind of problem, how to set exception breakpoint etc.

EDIT Since 9.1 release, it's no more reproducible.

Answer 1

As stated in comment to original question, there's no solution and no response on bug yet.

The openradar link: http://openradar.appspot.com/radar?id=6294934587965440

I'll be posting an updates here after the 9.1 release.

There are some empiric ways to come up with solution:

1. Override KVC setter setValue:forKey: and forbid empty string key.
2. Use always the latest stable SDK to build.

But again, no actual response from Apple neither.

EDIT Since 9.1 release, it's no more reproducible.