API - Missing call causes internal service error

I’m getting an internal service error when I’m making a call to:
/api/missing?page=1&pageSize=60&sortKey=date&sortDir=asc or /api/missing?page=1&pageSize=60&sortKey=series.date&sortDir=asc

with message: Instance property ‘date’ is not defined for type ‘NzbDrone.Core.Tv.Series’

when I’m making the call with sortKey=series.title it just works fine. Only date doesn’t seem to work.

Date isn’t a valid field, if you inspect the HTTP call in Chrome or FF’s dev tools you an see the other sortable property is airDateUtc.