Hello. I install NodeBB on Debian 9 with nginx/1.10.3. NodeJS version - v12.18.2. NPM version - 6.14.5. MongoDB version - v4.0.19. NodeBB version - 1.13.x.

After logging in, an error pops up:

It looks like your login session is no longer active, or no longer matches with the server. Please refresh this page.

And authorization flies .
In NGINX error log:

2020/07/12 14:56:28 [notice] 8942#8942: signal process started
2020/07/12 15:06:49 [alert] 8966#8966: *593 open socket #16 left in connection 25
2020/07/12 15:06:49 [alert] 8966#8966: *323 open socket #23 left in connection 88
2020/07/12 15:06:49 [alert] 8966#8966: *324 open socket #25 left in connection 90
2020/07/12 15:06:49 [alert] 8966#8966: *594 open socket #17 left in connection 99
2020/07/12 15:06:49 [alert] 8966#8966: aborting
2020/07/12 15:10:28 [alert] 9086#9086: *6 open socket #13 left in connection 6
2020/07/12 15:10:28 [alert] 9086#9086: *7 open socket #14 left in connection 7
2020/07/12 15:10:28 [alert] 9086#9086: aborting
2020/07/12 15:16:34 [alert] 9151#9151: *7 open socket #14 left in connection 7
2020/07/12 15:16:34 [alert] 9151#9151: *8 open socket #15 left in connection 8
2020/07/12 15:16:34 [alert] 9151#9151: aborting
2020/07/12 15:23:52 [alert] 9202#9202: *137 open socket #16 left in connection 6
2020/07/12 15:23:52 [alert] 9202#9202: *138 open socket #17 left in connection 25
2020/07/12 15:23:52 [alert] 9202#9202: aborting
2020/07/12 15:26:14 [alert] 9239#9239: *6 open socket #13 left in connection 6
2020/07/12 15:26:14 [alert] 9239#9239: *7 open socket #14 left in connection 7
2020/07/12 15:26:14 [alert] 9239#9239: aborting

config.json:

{
    "url": "https://mydomain.guru",
    "secret": "secretkeyhere",
    "database": "mongo",
    "mongo": {
        "host": "127.0.0.1",
        "port": "27017",
        "username": "nodebb",
        "password": "mypasswordhere",
        "database": "nodebb",
        "uri": ""
    }
}

How to fix this error?