Once per day I got my production server down with this error

Notice: Undefined index ....vendor/magento/module-developer/Model/View/Page/Config/RendererFactory.php on line 64

I've checked config for dev/front_end_development_workflow/type and it exists in database also and as default config in xml. Magento version 2.1.7

This error fixes with clearing cache but it's not a solution to do every time. Does anybody faced with this issue?

  • i have the same issue , any idea? Sep 19, 2017 at 19:56
  • I am having the same issue, are you running a multi-site setup? are you running with Redis? Sep 22, 2017 at 20:51
  • Nag Kernez, did you have any luck resolving this issue? I'm experiencing the same error and am curious how you solved it. Jan 15, 2019 at 10:00

3 Answers 3


You can find the fix here :


It worked for me and that is to set the compiling to server side less compilation and then deleted the row (for some reason).

After that re-run php bin/magento setup:upgrade

You can find the setting in : Stores->Configuration->Advanced->Developer-> turn to default settings scope -> Front end workflow


1) open PHPMyAdmin

2) select your database

3) go to core_config_data file

4) run this query

UPDATE `magento`.`core_config_data` SET `value` = '0' WHERE core_config_data`.`config_id` = 5;

5) and also

UPDATE `magento`.`core_config_data` SET `value` = '0' WHERE `core_config_data`.`config_id` = 6;

It works definitely!

  • 1
    I would never trust the config_id value to point to a specific configuration parameter, I would use the path. Jun 5, 2018 at 6:58
  • you can run this command : php bin/magento setup:di:compile and then refresh the frontend page , it's works
    – Ashish
    Jun 5, 2018 at 7:22

To see the correct error message, try to switch on developer mode "bin/magento deploy:mode:set" and disable all cache

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