[Bug]: Redis Cluster Error: Redis is already connecting/connected

[Karthick8s]

What happened?

When attempting to use Redis in cluster mode, the application throws a Redis connection error on startup.

USE_REDIS=true REDIS_URI=tcp-xxxxxxxxxx.cache.amazonaws.com:6379 USE_REDIS_CLUSTER=true

With same redis_uri when connecting with our golang service it is working.

Version Information

Error :-
2025-07-03 12:28:35 error: KeyvRedis connection error: Redis is already connecting/connected
2025-07-03 12:28:35 error: There was an uncaught error: Redis is already connecting/connected

Steps to Reproduce

Enable the following ENV:
USE_REDIS=true
REDIS_URI=tcp-xxxxxxxxxx.cache.amazonaws.com:6379
USE_REDIS_CLUSTER=true
Start the application.

Observe the error logs.

What browsers are you seeing the problem on?

No response

Relevant log output

When I use console.log i got below traceback
KeyvRedis connection error: Error: Redis is already connecting/connected
    at /librechat/node_modules/ioredis/built/cluster/index.js:110:24
    at new Promise (<anonymous>)
    at EventEmitter.connect (/librechat/node_modules/ioredis/built/cluster/index.js:106:16)
    at KeyvRedis.getClient (/librechat/api/node_modules/@keyv/redis/dist/index.cjs:182:28)
    at KeyvRedis.set (/librechat/api/node_modules/@keyv/redis/dist/index.cjs:196:31)
    at Keyv.set (/librechat/node_modules/keyv/dist/index.cjs:588:34)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async loadCustomConfig (/librechat/api/server/services/Config/loadCustomConfig.js:122:5)
    at async AppService (/librechat/api/server/services/AppService.js:34:19)
    at async startServer (/librechat/api/server/index.js:46:3) KeyvRedis {
  _events: [Object: null prototype] {
    ready: [Function (anonymous)],
    reconnecting: [Function (anonymous)],
    end: [Function (anonymous)],
    close: [Function (anonymous)],
    error: [
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)],
      [Function (anonymous)], [Function (anonymous)]
    ]
  },
  _eventsCount: 5,
  _maxListeners: 40,
  _client: <ref *1> Commander {
    options: {
      tls: {},
      clusterRetryStrategy: [Function: clusterRetryStrategy],
      enableOfflineQueue: true,
      enableReadyCheck: true,
      scaleReads: 'master',
      maxRedirections: 16,
      retryDelayOnMoved: 0,
      retryDelayOnFailover: 100,
      retryDelayOnClusterDown: 100,
      retryDelayOnTryAgain: 100,
      slotsRefreshTimeout: 1000,
      useSRVRecords: false,
      resolveSrv: [Function: bound querySrv],
      dnsLookup: [Function: lookup],
      enableAutoPipelining: false,
      autoPipeliningIgnoredCommands: []
    },
    scriptsSet: {},
    addedBuiltinSet: Set(0) {},
    slots: [],
    _groupsIds: {},
    _groupsBySlot: [ <16384 empty items> ],
    isCluster: true,
    retryAttempts: 0,
    delayQueue: DelayQueue { queues: {}, timeouts: {} },
    offlineQueue: Denque {
      _capacity: undefined,
      _head: 0,
      _tail: 0,
      _capacityMask: 3,
      _list: [Array]
    },
    isRefreshing: true,
    _autoPipelines: Map(0) {},
    _runningAutoPipelines: Set(0) {},
    _readyDelayedCallbacks: [],
    connectionEpoch: 1,
    _events: [Object: null prototype] {
      error: [Function (anonymous)],
      refresh: [Function],
      close: [Array]
    },
    _eventsCount: 3,
    _maxListeners: undefined,
    startupNodes: [ [Object] ],
    connectionPool: ConnectionPool {
      _events: [Object: null prototype],
      _eventsCount: 4,
      _maxListeners: undefined,
      redisOptions: undefined,
      nodes: [Object],
      specifiedOptions: [Object],
      Symbol(shapeMode): false,
      Symbol(kCapture): false
    },
    subscriber: ClusterSubscriber {
      connectionPool: [ConnectionPool],
      emitter: [Circular *1],
      started: true,
      subscriber: [Commander],
      onSubscriberEnd: [Function (anonymous)],
      lastActiveSubscriber: [Commander]
    },
    status: 'connecting',
    Symbol(shapeMode): false,
    Symbol(kCapture): false
  },
  _namespace: 'keyv',
  _keyPrefixSeparator: '::',
  _clearBatchSize: 1000,
  _useUnlink: true,
  _noNamespaceAffectsAll: false,
  Symbol(shapeMode): false,
  Symbol(kCapture): false
}

Screenshots

No response

Code of Conduct

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[nhtruong]

I got the exact same error when testing a redis cluster locally.

[nhtruong]

This PR will fix the issue: #8457