Android 6.0 Marshmallow : Weird error with fragment animation

Question

One of my apps in the app store works perfectly fine with Android 5.0, but since today I have my device upgraded to 6.0 I get strange errors. I narrowed it down to the fragment

Answer 1

For me it was a NullPointer exception masked as this because of Proguard obfuscation. Run without Proguard and hopefully you'll see the underlying exception.