Had to deactivate 404Page to make WordPress correctly

Resolved Nejra
(@nejra)

3 years ago

Hi,

After months of problem-free use of 404Page, suddenly certain admin pages in WordPress did not work anymore, with the totally unhelpful logmessages “Call to undefined function wp_get_current_user() in /home/public/sites/www.******.com/wp-includes/capabilities.php on line 522”.

Could only make it work again by deactivating 404Page.
As it did not make a difference at all to deactiavte or even uninstall a different very recently installed plugin – which I think was the real culprit.

How can this be?
Encountered similar things before, and it seems to me it has more to do with a non-robust wordpress plugin system than with the particular plugins.

And now I am without custom 404 page 🙁

Viewing 6 replies - 1 through 6 (of 6 total)

Plugin Author Peter Raschendorfer
(@petersplugins)

3 years ago

There must be any other causes. The 404page plugin uses the WP core function current_user_can(), defined in wp-includes/capabilities.php. This function uses another WP core function wp_get_current_user(), defined in wp-includes/capabilities.php. That’s all WP core stuff. It’s just to check if the user is allowed to access the admin page. This is a default WP functionality. That must work. Otherwise WordPress would not work at all.

Maybe a corrupted file? Could you please try to reinstall the 404page plugin plus WordPress itself?

Peter
icek123
(@icek123)

3 years ago
Having the same problem I was able to get around it by going to “Appearance->404 Error Page” and deselecting the “Hide the selected page from the Pages list” option.
- This reply was modified 3 years ago by icek123.
Plugin Author Peter Raschendorfer
(@petersplugins)

3 years ago

Thanks @icek123 for this clue. After detailed research I think this could happen if any other pluign – or maybe the theme – triggers a post query before all WordPress core files are completely loaded.

Would you please do me a favor and test it with the current development version of the 404page plugin? You can download it here: https://downloads.wordpress.org/plugin/404page.zip. I think this should solve that issue.

Thanks in advance
Peter

airplanenoise
(@airplanenoise)

2 years, 11 months ago

Peter,

Confirmed, your dev version fixes the issue for me on a specific site that was doing the same thing with 404 Page activated.

Could be that some other plugin was the root cause, but thanks to a recent upgrade to PHP7 I was able to see the stack trace and it lead me to 404 Page first, so that was it for me.

Cheers,

Kaz

Plugin Author Peter Raschendorfer
(@petersplugins)

2 years, 11 months ago

Final version 2.4 is out now. Please confirm the issue is solved and the topic can be closed.

Peter

Plugin Author Peter Raschendorfer
(@petersplugins)

2 years, 9 months ago

No more response since two months. Everything works fine in my tests, so I’m marking this issue as resolved.