When using "yield" with IEnumerables get error "System.InvalidProgramException : Common Language Runtime detected an invalid program."

[DiegoSilvaFG]

On my tests, if the tested method uses the keyword "yield" with IEnumerables it throws this exception:

Error Message:
 System.InvalidProgramException : Common Language Runtime detected an invalid program.
Stack Trace:
   at ServiceFramework.Persistence.LabelIndexHelper.<GeneratePairs>d__0.MoveNext()
...

MiniCover version: 2.0.0-ci-20180329054201

Method sample code:

public IEnumerable<string[]> GeneratePairs(string[] labels)
{
    if (labels == null || labels.Length == 0)
    {
        yield break;
    }

    for (var i = 0; i < labels.Length - 1; i++)
    {
        for (var j = i + 1; j < labels.Length; j++)
        {
            yield return new[] {labels[i], labels[j]};
        }
    }
}

The same code runs with no issues when using "dotnet test" line command.