Null error UnityAsync.AwaitInstructionAwaiter1[T].GetResult ()

[HarryHighPants]

I'm trying to do a simple WaitForSeconds but I get a null error at: UnityAsync.AwaitInstructionAwaiter1[T].GetResult ()

It works with no issues in editor (2019.2.16f1) however it throws the error on Android device (Pixel 2xl)
Have I missed an initialization step?

[muckSponge]

That should be valid code. If you try the latest commit, does it fix the problem?

[happyjellyfish]

I have same issue on latest commit on Android. Can you fix it plz?. Thanks