Do you know how to reproduce?

It looks like the frame was changed from {0, 0, 0, 0} to something weird, how was your setup of the header?

I'm not really sure on how to reproduce as these are coming from crash logs, and the stack trace doesn't provide any hints really. My setup is a CSStickyHeader subclass at the top with other cells at the bottom.

Hey so when I change the value of parallaxHeaderReferenceSize, should I invalidate the layout? Even if I change it in viewDidLoad?

Changing parallaxHeaderReferenceSize sounds reasonable to invalidate the layout. Would viewDidLoad will still have chance more than once after iOS 6?

What if in viewDidLoad, I'm setting parallaxHeaderReferenceSize just once?

I'll be checking the doc for viewDidLoad to see if there's any hints.
So for whom is not aware, calling invalidLayout after changing parallaxHeaderReferenceSize seemed to solve the problem, I'll submit a patch soon, thanks @rounak for the heads up!

👍 Thanks for all your work @jamztang!

Thanks @rounak. I'm checking out other issues and see if there's any more things I can squash into this update before pushing a new version :)

@jamztang It happens to me in Simulator, but not in device

Simulator: Xcode 6.2 / iOS 8.2
Device: iPhone 6 / iOS 8.2

After doing a pod update, it disappears (without clean up or removing the app from Simulator)

Downloading dependencies
Installing AFNetworking 2.3.1 (was 2.3.1)
Installing Appsee 2.1.3 (was 2.1.2)
Installing Bolts 1.1.4 (was 1.1.3)
Installing CSStickyHeaderFlowLayout 0.2.4 (was 0.2.4)
Installing DZImageEditing 1.0.0 (was 1.0.0)
Installing DZNEmptyDataSet 1.5.2 (was 1.4.1)
Using DZNPhotoPickerController (1.5)
Installing DateTools 1.5.0 (was 1.5.0)
Installing Facebook-iOS-SDK 3.23.2 (was 3.21.1)
Installing POP+MCAnimate 2.0.1 (was 2.0.1)
Installing Reachability 3.2 (was 3.2)
Installing SDWebImage 3.7.2 (was 3.7.1)
Installing UIActivityIndicator-for-SDWebImage 1.2 (was 1.2)
Installing pop 1.0.7 (was 1.0.7)
Generating Pods project
Integrating client project