503 when trying to access admin route

[MTheProgrammer]

The menu block is unable to fetch categories for current store

Preconditions

1. Magento CE 2.1.6 && EE 2.1.7
2. Set admin panel frontName in etc/env.php different than admin

Steps to reproduce

1. Go to http://domain.com/admin

Expected result

1. Redirect to 404 page

Actual result

1. Error in sql selecting from not existing table catalog_category_flat. This is caused by fact that actual store id is 0.

[Andrii-Deineha]

@MTheProgrammer Hi, I cannot reproduce this issue. Please provide the detailed steps we must follow to reproduce this issue. In addition, identify the web server you are running, the versions of PHP and MySQL, and any other information needed to reproduce your issue.

[veloraven]

According to contributor guide, tickets without response for two weeks should be closed.
If this issue still reproducible please feel free to create the new one: format new issue according to the Issue reporting guidelines: with steps to reproduce, actual result and expected result and specify Magento version.