Consistent 500 on PUTs

I'm trying to create various things on dev.inrupt.net, but it fails consistently on PUT:

Error: FAILED to save new tool at: https://kjetiltest1.dev.inrupt.net/public/test2/index.ttl : Web error: 500 (Internal Server Error) on PUT of <https://kjetiltest1.dev.inrupt.net/public/test2/index.ttl>
Error: FAILED to save new tool at: https://kjetiltest1.dev.inrupt.net/public/testchat1/index.ttl : Web error: 500 (Internal Server Error) on PUT of <https://kjetiltest1.dev.inrupt.net/public/testchat1/index.ttl>
Error: FAILED to save new chat channel at: https://kjetiltest1.dev.inrupt.net/public/longchat1/index.ttl : Web error: 500 (Internal Server Error) on PUT of <https://kjetiltest1.dev.inrupt.net/public/longchat1/index.ttl>
Error: Error writing meeting configuration: Web error: 500 (Internal Server Error) on PUT of <https://kjetiltest1.dev.inrupt.net/public/testmeeting1/index.ttl>
Error: FAILED to save new scheduler at: <https://kjetiltest1.dev.inrupt.net/public/event1/details.ttl> : Web error: 500 (Internal Server Error) on PUT of <https://kjetiltest1.dev.inrupt.net/public/event1/details.ttl>

I can't reproduce this on any of my installs.

The report names only PUT requests to the listed dev.inrupt.net URLs and no files or tests. Start by reproducing one failing PUT and comparing it with the reporter's working installs, then trace the server's PUT handling using its error output. Done means the affected resources can be created successfully without 500 responses and the failure has a regression check.