XF 1.5 Server error site wide including admin.

[Stuart Wright]

https://www.avforums.com

Server Error
Invalid argument supplied for foreach()

1. XenForo_Application::handlePhpError() in Dark/PostRating/Model/User.php at line 14
2. Dark_PostRating_Model_User->prepareUserFetchOptions() in XenCentral/Trade/Model/XfUser.php at line 22
3. XenCentral_Trade_Model_XfUser->prepareUserFetchOptions() in XenForo/Model/User.php at line 438
4. XenForo_Model_User->getUserById() in XenForo/ControllerAdmin/Login.php at line 10
5. XenForo_ControllerAdmin_Login->actionForm() in XenForo/FrontController.php at line 347
6. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
7. XenForo_FrontController->run() in /home/sites/avforums/public_html/admin.php at line 13

This follows editing the config.php to add

$config['cache']['frontendOptions']['automatic_serialization'] = true;

It crashing the site, and then reverting it.
Any ideas please?
AVForums is down at the moment.

 

[Chris D]

I think you would need to take steps to purge the existing cache after enabling that.

 

[Stuart Wright]

I think you would need to take steps to purge the existing cache after enabling that.

Thank you Chris. I've put the option back in and asked Tim to flush the cache.
Hopefully that will fix the site.
I don't know about these server things. I wish there was a guide of some sort.

 

[Stuart Wright]

Still getting the error. Is there a way to disable a particular addon without access to the front or back end?
It looks like it's the post ratings addon which is causing the crash.

 

[Chris D]

Set enableListeners to false and then disable the problematic add on in the admin CP. You should then be able to set enableListeners to true.

 

[Stuart Wright]

Thanks Chris. Nightmare this has been.

 

[MattW]

If you are running Memcached, ensure they restart that as well.

 

[Stuart Wright]

I guess this is related, but now if I try to save a new thread with a prefix or edit a thread to add a prefix I get a front end crash
Fatal error: Cannot use string offset as an array in/home/sites/avforums/public_html/library/PrefixForumListing/Extend/DataWriter/Discussion/Thread.php on line 24

Have disabled that addon and will post in the discussion thread for it.

 

[Stuart Wright]

All sorted, thanks all for your help. Tim @NimbusHosting fixed by changing the cache prefix after adding the line in config.php.