problem with SELECT * FROM VersionableType

Using matching 0.5.0 releases of Workbench and the inMemoryServer (but this happened with previous versions too)

I can do this select and it works fine using the query function of Workbench.
SELECT * FROM DocumentTopLevel as d where d.StringPropTopLevel = 'xxx'

However if I do the same function using VersionableType I get a nullPointer exception at the server (which propagates back to workbench)
SELECT * FROM VersionableType as d where d.VersionedStringProp = 'xxx'

Not seeing anything wrong with this query. Need this to work for the IOD demo.