I managed to create a change that cannot be accessed: https://gerrit.wikimedia.org/r/359241. I was editing it with no problems, then I suddenly got an Internal Server Error and nobody can access it anymore.
From Paladox T168012#3353152
@Dzahn kindly looked in the logs and found this error for my change
[2017-06-15 21:25:28,800] [HTTP-67550] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in GET /r/changes/356181/revisions/c0f8da0e921aca0f8178ac561ea2987fc6f1c29e/files?reviewed
this error is fixed in gerrit 2.14 as i got this error upstream and reported it too.
Here's the bug upstream https://bugs.chromium.org/p/gerrit/issues/detail?id=6176
Here's the fix https://gerrit-review.googlesource.com/#/c/106613/