Error Message Details

The exact error message is as follows:


{"0":"Unable to serialize value.","1":"#0 /var/www/html/vendor/magento/framework/App/PageCache/Kernel.php(153): Magento\Framework\Serialize\Serializer\Json->serialize(Array)#1 /var/www/html/vendor/magento/module-page-cache/Model/Controller/Result/BuiltinPlugin.php(96): Magento\Framework\App\PageCache\Kernel->process(Object(Magento\Framework\App\Response\Http\Interceptor))#2 /var/www/html/vendor/magento/framework/Interception/Interceptor.php"}
Possible Solutions

This error often occurs due to a problem with caching or serialization.

Try the following steps to resolve the issue:

Check Data Integrity

Examine the data being serialized to ensure it's in the correct format and doesn't contain any unexpected characters.

Look for discrepancies between the homepage data and other pages.

Review Custom Code

If you have any custom code that interacts with the homepage, review it for any potential serialization issues.

Pay attention to how data is handled and passed around.

Debug Serialization Process

Use Magento's built-in debugging tools or enable logging to trace the serialization process.

This can help pinpoint the exact location or module where the serialization error occurs.

Verify PageCache Configuration

Ensure that the PageCache configuration is correct, and no misconfigurations are interfering with the homepage caching process.

Check PHP Serialization Settings

Verify that the PHP serialization settings are compatible with the data being serialized.

Adjust the settings if necessary to accommodate the data structures used on the homepage.

Cache Clean and Flush

Perform a thorough cache clean and flush, including both the Magento cache and any other caching mechanisms in use, such as Varnish or Redis.

This error often occurs due to a problem with caching or serialization.

Try the following steps to resolve the issue.

Dealing with serialization errors in Magento 2.2.6 can be challenging, but by carefully examining the data, reviewing custom code, and debugging the serialization process, it's possible to identify and resolve the root cause of the issue.

Remember to verify the PageCache configuration and PHP serialization settings, and perform thorough cache cleaning to ensure a smooth browsing experience for your customers.