The attic corruption in question is apparently caused by a bug in the version of msgpack the reporter was using, can be mitigated by updating dependencies - see <a href="https:&#x2F;&#x2F;github.com&#x2F;jborg&#x2F;attic&#x2F;issues&#x2F;264" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;jborg&#x2F;attic&#x2F;issues&#x2F;264</a>