enomoto celtislab

Perhaps flush_rewrite_rules is running on all pages.

Please search by keywords such as flush_rewrite_rules all page.

Because other plugins or themes run flush_rewrite_rules on all pages, I think that the Rewrite_rules data is always updated.

If you take measures against flush_rewrite_rules running on all pages, this problem will be solved.

Are you using any custom post type?

Although it is speculation, it seems that a warning has occurred because you accessed the array using type data (empty string) even though you can not get a custom post type.

I can not do it right away, but I would like to take some measures by the end of this month.

It seems that it is caused by Rewrite_rules being updated / cleared.

Why is Rewrite_rules updated frequently? , You need to find out what plugin you are updating.

There is no way to stop this phenomenon if there is a reason to frequently update the Rewrite_rules data.

Filtering on page 404 is not possible.

I have not used a multi language language plug-in, so I do not know.

It seems that multi-language processing is doing special things, so it is difficult to filter by language.

It does not reproduce. What is your PHP version?

I do not know because I do not use ACF.

Does PHP error not come out unless you use Plugin Load Filter?

If you know the details of PHP error, it may be a clue.

I am using WP 5 without problems in my environment.
Where is the problem coming out.

The plugin load filter works as a must-use plugin in its mechanism.

In the operation with the must-use plugin, since wp_set_current_user has not been executed yet, is_user_logged_in is false until wp_set_current_user is executed.

Since it is a security plug-in, you may want to make a judgment as soon as possible, but it can not be determined with is_user_logged_in that wp_set_current_user is not being executed, so it may be necessary to judge directly from cookie.

It does not reproduce in my environment.

Update of plf_queryvars data is done when rewrite_rules data is updated / cleared.

Rewrite_rules is often updated when you normally activate / deactivate a plug-in, but for some reason it may be that there are plug-ins that update this data frequently.

Setting of 3rd image.
I think that it is hard to understand because it is opposite to the assumed usage, but I choose “Activate Plugins” instead of “Not Use”.

By selecting “Activate Plugins”, individual settings of this post alone will be used.

If you check the setting for each plug-in here, it will be activated, but since the plug-in not checked is deactivated, please save the setting without checking.

Is it that the setting value is cleared and returns to the initial state after a certain time has elapsed?

There are no reports of similar problems.
Since the cause is unknown, measures are difficult if you do not know how to reproduce it.

Has an error occurred in Javascript, or is the access to “admin – ajax” blocked by site security function?

Are you using the Ajax filter of “URL Filter fot Expert”?

When Ajax prohibits plug-in, there is a problem that plug-in is not displayed due to being influenced by setting display for each individual page.

For the time being please enable Ajax at all.
Fixed so that it will work excluding setting action by Ajax of plugin load filter in the near future.

inverse case.

1. is the same

2. Activate page type filter to activate all groups (all page type selection).

3. Set deactive plug-in in meta box of individual page (do not select check box).

Since we use Ajax to set the meta box of each page, it does not work if an error occurs in Javascript or access to admin-ajax is blocked by the security function of the site.