AdBannerView crashes app when it is clicked

Question

I have an Ad on my app which, before when you clicked on it, would load up the standard test ad screen though recently when I have done this it come back with this error:

*** Assertion failure in NSDictionary *_UIRecordArgumentOfInvocationAtIndex(NSInvocation *, NSUInteger, BOOL)(), /SourceCache/UIKit/UIKit-2380.17/UIAppearance.m:1118

This doesn't seemed to have happened to anyone else from a google

I am testing on ios 6 which is where the bug happens and works fine on IOS 7

Answer 1

This issue seems to be caused by a global appearance setting.
There is a similar error cause by this setting as pointed out in this question:

Use UITextAttributeTextColor instead of NSForegroundColorAttributeName.