Intermittent lua error "user_script:28: attempt to compare number with nil"

[rbalaine]

Hello!
I'm currently migrating from bull to bullmq and I can see the following lua script error in my logs:

ReplyError: ERR Error running script (call to f_2aabbf31d90ee84a7e1b78cd1cf562abca6174b3): @user_script:28: user_script:28: attempt to compare number with nil  stack="ReplyError: ERR Error running script (call to f_2aabbf31d90ee84a7e1b78cd1cf562abca6174b3): @user_script:28: user_script:28: attempt to compare number with nil
    at parseError (/queue/node_modules/redis-parser/lib/parser.js:179:12)
    at parseType (/queue/node_modules/redis-parser/lib/parser.js:302:14)"

This is happening after successfully running a job. Sometimes directly after job completion, sometimes a few minutes later. Most of the time this error appears 2 times.
It doesn't seem to have any impact. The job is moved to completed status, emit the associated event and finally removed (thanks to { removeOnComplete: true } option).
There is no other job waiting to be processed after.

I've tried to identify the affected LUA script without success.

Some other information:

• We have several Worker instance per queue, one for each different job processor
• We share a Redis connection instance between Queue and Workers. I've tried to use a new instance for each Worker, it doesn't change anything
• We also have a QueueScheduler and a QueueEvents instance per Queue.

Have you ever experienced that issue? Do you have any idea of which command could cause that? Maybe moveToFinished-7.lua?

[rbalaine]

Never mind, I just found an issue in my code. Queue.clean method signature have change between bull and bullmq, limit and type parameters are inverted 😅

[manast]

I heavily recommend to use typescript only to avoid all these problems and for many more benefits.