Saving wp-admin/options.php with W3TC Minfy Results in WSOD

Hello @plan9,

WSOD in 99% of the cases are caused by a 500 error, so there should be something in the error logs
Enable debugging to see the 500 error. If that doesn’t help, use WP_DEBUG_LOG

Hi @vmarko

Thanks for the suggestion. I already tried enabling debugging with nothing showing up. I just tried enabling the debug log – but this too showed nothing.

I also checked that the WP options table is not corrupted – it is fine.

Hello @plan9,

We are unable to replicate this issue. I can offer you our Pro support so we can investigate this. You can contact us directly via plugin Performance>Support.

Hello @vmarko

Thanks for trying to replicate the issue.

I managed to fix it by taking the following steps:

1. Export settings from W3TC plugin general settings
2. Disable W3TC plugin
3. Delete W3TC plugin
4. Using phpMyAdmin export backup of database, then search in ‘options’ table using option_name and operator ‘LIKE %…%’ for ‘w3tc’
5. Delete the results
6. Re-install W3TC plugin and import settings (I’m not sure this step is strictly necessary as I think the settings were already correctly populated – I think they are stored in a static file).

Editing / saving wp-admin/options.php now behaves as expected. I guess this procedure could also be used as a final resort to solve other W3TC issues.

Hello @plan9,

Thank you for providing your solution.
Glad to know that the issue is resolved!

Hello,

I’m having the same issue, but I think the problem is more serious because even calling update_option does not work. I tried uninstalling the plugin and still having this issue.

@plan9 I’m not into database too much, could you tell me the exact query you entered to remove W3TC database entries?

Thank you
Dídac

Hello @estudio-de-grabacion)

I used the following to remove W3TC entries from the WP options table:

DELETE FROM ‘wp_options’ WHERE ‘option_name’ LIKE ‘%w3tc_%’

If you want to see what is being deleted run this first:

SELECT * FROM ‘wp_options’ WHERE ‘option_name’ LIKE ‘%w3tc_%’

• This reply was modified 5 years, 6 months ago by George M.
• This reply was modified 5 years, 6 months ago by George M.
• This reply was modified 5 years, 6 months ago by George M.

You need to add spaces – spaces are being removed from the query when posted here

Thank you @plan9 for your help,

I deleted the entries from the DB but I still have the same issue. Not sure what it can be because I’ve looked on the internet and this was the only thread with a similar issue. I have disabled all plugins and set default theme and I still can’t update options.

Hello again,

Turns out it was a problem with a php.ini setting. The value max_input_vars which is set to 1000 by default. When saving the page it was unable to send the request correctly because there were more than 1000 values on wp_options. Not sure why the function update_option did not work though.

Anyway, in my case, it had nothing to do with w3tc.

Thank you!

@estudio-de-grabacion

Glad to hear you resolved your problem. max_input_vars would have been my next suggestion – I tried increasing that before deactivating plugins.

wp_options table is generally a mess. I don’t understand why this aspect of WP has been left like this.