Lineplot visualization 500 error - SCORE S. mansoni - occupation filter

[bobular]

Any filtering on the occupation variable causes the 500.
The plot works fine with the occupation filter removed, or with other filters on Participant variables.
I haven't looked at the logs to diagnose/triage further but can do next week. Just wanted to leave a placeholder. Hope it's not a duplicate.

[bobular]

This one is something to do with the fact that there are no entities with data for both the hookworm and occupation variables. Occupation data wasn't gathered in Cote d'Ivoire. Hookworm data wasn't collected in East Africa. @d-callan is this your domain? Could look at after your vacation!