Closed Issue: Fluent Assertion throws System.NullReferenceException [11900]

I have a test performing the following test:
alarmConfigViewModel.ShouldHave().AllProperties().IncludingNestedObjects().EqualTo(expectedAlarmConfigViewModel);

When it executes it throw a NullReferenceException. I've gone through the properties of alarmConfigViewModel and expectedAlarmConfigViewModel and both appear to be the same.

I have included a stack trace as an attachment.