Onboarding failing with error message

[sachins-geekyants]

Describe the bug
I am trying to onboard in wavi.ng app and onboarding is failing with
NoSuchMethodError: The method '[]' was called on null. in onError callback.

To Reproduce
Steps to reproduce the behavior:

1. use at_onboarding_flutter: 3.0.4
2. when backup key is selected to authenticate , onError callback gets called.

Expected behavior
onboard should be successful.

Screenshots

Smartphone (please complete the following information):

• Device: [e.g. iPhone11]
• OS: [e.g. iOS14.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 59]

Were you using an @‎application when the bug was found?

• @ wavi.ng

[yahu1031]

@sachins-geekyants Try evaluating the value atValue.value at line 85.