I already re-installed onto a new server. I was only testing .. If I do reproduce I will make sure to provide stacktrace. I do appreciate you looking into this. I will make sure in the future that I can provide more details.

It was mongo, i was able to resolve it by re-creating the category.

Thank you for this amazing platform. I ran into an unusual issue where I have a category CID coming back from the cache and I have no reference to it anywhere within any of the collections on the mongo database.

I have attemtped to trace this back to the cache library and tried to perform a cache reset also. I have also re-build all assets with ./nodebb build. Where can I clear this bogus cid. Its crashing the entire server and I need to clear it.

For now I just added a temporary filter on the cids array to manually remove it and this is temporarily fixing my problem and allowing nodebb server to start and operate fine.

Before I do any more review of the codebase, I was wondering if I am just missing something.

So for example the cids will come back as:

[ '1', '2', '3', '4' ]

'4' is bad cid. It is non-existant and must be removed from cache. This '4' does not exist in database and causes nodebb to crash.

I cannot clear '4' cid from cache.

So my temporary fix is to do

.filter(cid => cid !== '4') // This is fixing for now.

https://github.com/NodeBB/NodeBB/blob/master/src/categories/index.js#L87

Categories.getAllCidsFromSet = function (key, callback) {
	const cids = cache.get(key);
        // ...
})

Any advice I greatly appreciate!