High Volume of Crashes on iOS9 in line: [self.viewToMagnify.layer renderInContext:context];

[LaChrome]

The bug tracker I'm using is picking up a high number of crashes for iOS9 users, from within the function:

• (void)drawRect:(CGRect)rect

At the last line: [self.viewToMagnify.layer renderInContext:context];

Details of the exception:
Fatal Exception: CALayerInvalidGeometry
sublayer with non-finite position [inf inf]

Any ideas on what is causing the crash? I don't see any crashes in previous versions of iOS. Just 9+ across all device types (iPhone, iPad, iPod Touch).

Thanks,

Chris