etherpad-lite: Etherpad-lite version 1.9.2 doesn't work with redis database backend

Describe the bug

Somehow the connection to the redis database backend doesn’t work anymore with etherpad-lite version 1.9.2. Version 1.9.1 still works fine, so I stay a moment longer with the old version.

To Reproduce Steps to reproduce the behavior:

1. Configure remote redis database
2. Install etherpad-lite on a fresh system (Debian 11 Bullseye with nodejs version 18.17.1 from nodesource)
3. Start etherpad-lite with bin/run.sh

Expected behavior A running etherpad-lite instance …

Server (please complete the following information):

• Etherpad version: 1.9.2
• OS: Debian 11.7
• Node.js version (node --version): 18.17.1
• npm version (npm --version): 9.6.7
• Is the server free of plugins: no plugins activated

Configuration

{
  "ip": "0.0.0.0",
  "port": 9005,
  "dbType": "redis",
  "dbSettings": {
    "socket":{
      "host": "10.0.9.39",
      "port": 6384
    },
    "password": "VERYSECUREPASSWORD"
  },
  "users": {
    "superadmin": {
      "is_admin": true,
      "hash": "VERYSECUREPASSWORDHASH"
    }
  },
  "commitRateLimiting": {
    "duration": 1,
    "points": 100
  },
  "loglevel": "DEBUG"
}

Log https://paste.momou.ch/?9d5dc5bae685d476#GpRm8M7gk5dyouNGE2oDeJf6htDnKKF7GhKGfxD9B5N3

Probably the relevant part is:

[2023-08-28 11:48:56.715] [INFO] console - Your Etherpad version is 1.9.2 (b1c34b5)
[2023-08-28 11:48:56.718] [DEBUG] secret-rotation expressSessionSecrets - new secret rotator (interval 86400000, lifetime: 864000000)
[2023-08-28 11:48:56.719] [DEBUG] secret-rotation expressSessionSecrets - starting secret rotation
[2023-08-28 11:48:56.719] [DEBUG] ueberDB - GET    - expressSessionSecrets:*-null - null - from database 
[2023-08-28 11:48:56.720] [ERROR] server - Error occurred while starting Etherpad
[2023-08-28 11:48:56.720] [ERROR] server - Metrics at time of fatal error:
{
  "httpStartTime": 0,
  "memoryUsage": 153112576,
  "memoryUsageHeap": 57215112,
  "ueberdb_lockAwaits": 0,
  "ueberdb_lockAcquires": 0,
  "ueberdb_lockReleases": 0,
  "ueberdb_reads": 0,
  "ueberdb_readsFailed": 0,
  "ueberdb_readsFinished": 0,
  "ueberdb_readsFromCache": 0,
  "ueberdb_readsFromDb": 0,
  "ueberdb_readsFromDbFailed": 0,
  "ueberdb_readsFromDbFinished": 0,
  "ueberdb_writes": 0,
  "ueberdb_writesFailed": 0,
  "ueberdb_writesFinished": 0,
  "ueberdb_writesObsoleted": 0,
  "ueberdb_writesToDb": 0,
  "ueberdb_writesToDbFailed": 0,
  "ueberdb_writesToDbFinished": 0,
  "ueberdb_writesToDbRetried": 0,
  "totalUsers": 0,
  "activePads": 0
}
[2023-08-28 11:48:56.722] [ERROR] server - TypeError: Cannot read properties of null (reading 'map')
    at SecretRotator._update (/srv/etherpad-lite/src/node/security/SecretRotator.js:169:30)
    at async SecretRotator.start (/srv/etherpad-lite/src/node/security/SecretRotator.js:108:5)
    at async exports.restartServer (/srv/etherpad-lite/src/node/hooks/express.js:186:5)
    at async exports.createServer [as hook_fn] (/srv/etherpad-lite/src/node/hooks/express.js:69:3)
[2023-08-28 11:48:56.723] [INFO] server - Exiting...
[2023-08-28 11:48:56.723] [INFO] server - Waiting for Node.js to exit...
[2023-08-28 11:49:01.723] [ERROR] server - Something that should have been cleaned up during the shutdown hook (such as a timer, worker thread, or open connection) is preventing Node.js from exiting
[2023-08-28 11:49:01.723] [ERROR] server - Enable `dumpOnUncleanExit` setting to get a dump of objects preventing a clean exit
[2023-08-28 11:49:01.723] [ERROR] server - Forcing an unclean exit...