Cannot Identify users attached to no segment

Your software
My Mautic version is:2.16.0
My PHP version is: 7.2.27

Your problem
My problem is: where are contacts that are not associated with any segment, stored? Or are they simply known as not associated with any segment and that’s that?

How can someone search for ONLY contacts not associated with a segment? There doesn’t seem to be a way to filter and separate out contacts not associated with segments vs. those associated with contacts. .

These errors are showing in the log:

Steps I have tried to fix the problem:

Hmm, that’s a good question!

I couldn’t see anything obvious in the search filters that are available, I’ve asked in the dev channel on Slack.

Depending on how many segments you have, it might be possible to chain negatives (e.g. !segment + !segment2 + !segment3) although that would rapidly become unmanagable.

Perhaps something to add as a feature request, explaining the use case (e.g. why you would want to see all contacts who are not in any segments)?