[Archivesspace_Users_Group] Failure in periodic indexer worker thread

[Hawk, Patrick]

Hello,

I'm trying to upgrade Archivesspace from 1.4.2 to 1.5.3 but I'm having
issues getting my content to fully load.  I followed the instructions here:
http://archivesspace.github.io/archivesspace/user/upgrading-to-a-new-release-of-archivesspace/.
I removed the directory /archivesspace/data/indexter_state and
/archivesspace/data/solr_index/index as the directions stated I should do
when upgrading to 1.5.0.  I also ran the setup-database.sh without issue.

However, I receive the following error:  Failure in periodic indexer worker
thread: {"error":"undefined method `related_records' for nil:NilClass"} in
the archivesspace.out file.  At this point the logs suggest that all items
have been re-indexed but my content does not fully load.  Any suggestions?
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