I got an error

Hello, I get this error when i try to acces any product in my catalog.
Fatal error: ControllerExtensionModuleProductFilter::getList(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "AdvancedFilter" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide an autoloader to load the class definition in /home/domains/controller/extension/module/product_filter.php on line 208
I got the OpenCart version 2.3.0.2
Thank you for helping me.

Perhaps you have a filter extension that's breaking it.

Caused by an installed extension.

No extension was installed recently and I just got the error suddenly two weeks ago.
I am beginner with Opencart and I have no idea to solve it.
Thank you

You did not mention the Theme you use, but anyway, I strongly advise you,
to download and use the latest updated Version of OC v.2.3.0.2, to also
have PHP v.7.x working on our Site. Your Hoster possibly updated PHP, and
that might by a reason, why you suddenly run into a problem. Besides of the
fact, that some misses, found in the 'original 2.3.0.2', have also been fixed now.
Ernie

https://github.com/condor2/Opencart_2302