Media Type Issue

[SeasiaInhouse]

App is crashing when i specify mediaTypes as PHAssetMediaType.image.

My Code is:

let gmImagePicker = GMImagePickerController()
gmImagePicker.delegate = self
gmImagePicker.title = ""
gmImagePicker.mediaTypes = [PHAssetMediaType.image]

    self.present(gmImagePicker, animated: true, completion: nil)

And the crash is:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'