Trying to remove fragment from view gives me NullPointerException on mNextAnim

I know you’ve solved this yourself, but I want to explain how this error happens, since it just happened to me.

Basically you’re calling hide(), remove(), etc., with a null value.

The error isn’t obvious, and the stack trace doesn’t originate from your own sources when this happens, so it’s not trivial to realise what it is.

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