With a variable of datatype IEnumerable<String> and using the yourVar.Concat({"Add this value"}) expression, if yourVar is not initialized (ie New List(Of String) then it throws this exception:
However, this immediately faults the job. It is not caught as a system nor business exception by the Try Catch.
I’m not looking for help here, I’m reporting a bug. There’s nothing wrong with the automation nor the Try/Catch. It was all working fine until I added this one expression and forgot to initalize the IEnumerable.