Autoreport fails with `TypeError unhashable type: 'list'`

[joshuaberetta]

Exception TypeError unhashable type: 'list' being thrown from here:

formpack/src/formpack/reporting/autoreport.py

Line 86 in 482172c

counter.update(values)

Sentry: https://sentry.kbtdev.org/organizations/kobo/issues/167106
Community: https://community.kobotoolbox.org/t/this-report-cannot-be-loaded-error-h1-server-error-500-h1