If I remember correctly this was a bug in the way the sample data was installed which has now been fixed. All you have to do is to save the category and then you wont have it again (I think)

you need to change the category creator

@brianteeman : No this was a clean installation of 3.6.0 (without any sample data) that was updated to 3.6.2 - but I don't know if this warning appeared also in 3.6.0 or if this came with the later updates. Saving the category does not help. Only set an user as creator take it.

@andrepereiradasilva : correct - but in my eyes this is a bug that must be checked. I could test a clean installation of 3.6.2 and report the result if needed.

in installation that's already solved
See #11252 and #11245

Dont test 3.6.2
Download the latest staging from here and test that
https://github.com/joomla/joomla-cms/archive/staging.zip

On 30 August 2016 at 21:33, Frank notifications@github.com wrote:

@brianteeman https://github.com/brianteeman : No this was a clean
installation of 3.6.0 (without any sample data) that was updated to 3.6.2 -
but I don't know if this warning appeared also in 3.6.0 or if this came
with the later updates. Saving the category does not help. Only set an user
as creator take it.

@andrepereiradasilva https://github.com/andrepereiradasilva : correct -
but in my eyes this is a bug that must be checked. I could test a clean
installation of 3.6.2 and report the result if needed.

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Ok, I have tested with latest staging build and in the table xxxxx_categories the userid is set correctly. No warning apears on editing the standard categories.

BUT: will this issue be solved with the upcoming update 3.6.3 on a site using 3.6.2 or older?

BUT: will this issue be solved with the upcoming update 3.6.3 on a site using 3.6.2 or older?

that i know of, there is no PR for that

That'd be manipulating user data and I would suggest not having a patch to do that. The same thing happens if you delete a user on a site that was the creator of that content anyway.

I have checked an old demo site for a possible client with Joomla! 3.4.5 running who is no warning apear. In the publishing tab there is no creator entry and the Userid is also 42 in the database table (see screenshots). No idea to solve this on updates of older Joomla Installations.

The only way to update it on older sites would basically be to load every user ID from every record into memory, query the users table to get all the current user IDs, filter that out of the first list you got (so you're only left with non-existing user IDs), and change those to some other arbitrary value. And as I pointed out earlier, it's messing with user data (with other implications as it ties into the ACL system). Someone could create a standalone script to do all of that, but it really should not be a step taken by core at any point.

Just because earlier versions didn't raise an error doesn't mean that the behavior was correct. Maybe it was silently discarded somewhere or a new error was added that actually raises attention to the missing data, hard to say since a lot has changed from 3.4.5 up to present.

The database field "created_user_id" can be filled with 0 related to the field "created_time" = "2011-01-01 00:00:01" that is . In this case no warning apear. Can this be the solution?

The other bad site of this solution is that an possible script change all edited categories with an existing user as creator too. Not the best solution in this case.

It's fixed in current staging thus I'm closing this issue.
Also as @mbabker explained there isn't really anything we can do.