TypeError: Cannot read property 'clients' of undefined - 5.4.0

[waninkoko]

Hi,

Today, a socket.io server (2.3.0) which is using this Redis adapter (5.4.0), crashed unexpectedly with the following error and stacktrace:

TypeError: Cannot read property 'clients' of undefined
    at Timeout._onTimeout (/opt/app/node_modules/socket.io-redis/index.js:485:133)
    at listOnTimeout (node:internal/timers:555:17)
    at processTimers (node:internal/timers:498:7)

From what I've been able to see, the timeout around that line (485) was triggered and the retrieved request did not exist (I guess because it was removed somewhere else from the array), causing the above crash.

Thank you.