jsonProperty is null in ISchemaBoundTraversalExtensions

[simonziegler]

I cloned this repo today and ran the GremlinSample project: the only modification I made was the connection details for my Cosmos database.

When the program reaches line 39 of Program.cs, I attempt to step over in debugging and get the exception shown in the screen grab below from the ISchemaBoundTraversalExtensions class.

Just to reiterate, I only altered code on line 13 of Program.cs for connection details.

One other thing: what should the partition key be for GremlinSample?

Thanks, Simon