Browsing any page of a server in slave mode missing its replication token results in the unhelpful ISE below.

Internal Server Error

Oops, something went wrong!

Error message: (No details about this error are available)

Time: 2019-06-21 07:54:36 UTC

Host: 0647cc3dabca

Interface language: en

URL: http://localhost:5000/

Request data:
$VAR1 = { 'query_parameters' => {}, 'body_parameters' => {} };
 

We're terribly sorry for this problem. Please wait a few minutes and repeat your request — the problem may go away.

If the problem persists, please report a bug and include any error message that is shown above.

Either details should be provided with this error,
or website should be available in read only with an error banner.

Note: Web service works fine in this case.