Minimongo collection returns additional document with `_id: undefined`

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1

since updating an old app to meteor 2.6 (its now on meteor 2.13.x), some Meteor collections in the browser return an additional record, which is a copy of another record, but it’s _id is undefined.

On the server, everything is correct. I also don’t see that this additional document is published through the DDP connection.

I suspect its some bug in some old package we use, but its a bit hard to pin it down. I already ruled out subs-cache.

That’s why i ask the community whether someone has had a similar problem to narrow it down to a certain package.

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2

ok, found the issue, it was FastRender or the way we init the data. We still had some code that would manuall call FastRender.init, which added additional entries without an id

3

Something similar has appeared to me after async/await usage, 1% of inserts become duplicated.

I reverted async/await and it’s not happening anymore. It’s very hard to examine the issue and I couldn’t reproduce this behavior.

4

this is probably something very different than this issue here