It seems to happen when there is a member not associated with a user card. I fixed this particular page by updating the member list and refreshing the cache. But I'll have to work on a deeper fix and submit a patch.
Ethan McCutchen.....2018-01-31 16:31:28 UTC
those tables now exclude anything on the researcher list that isn't a valid user card.
Ethan McCutchen.....2018-02-19 18:58:59 UTC