On opening a certain product page, we are getting the following error

"exception":"[object] (Zend\\Http\\Header\\Exception\\InvalidArgumentException(code: 0): Invalid header value detected at /app/6l7tzyfknugxk/vendor/zendframework/zend-http/src/Header/GenericHeader.php:53)"

We cannot find anything wrong in the product info in the admin.

  • Did you install any new modules? This can probably cause problems, for example an older version of LiteMage Jun 15, 2021 at 10:34
  • We don't have Litemage installed
    – GenZ Dev
    Jun 15, 2021 at 10:37

1 Answer 1


Check the names of your products, maybe it contains special characters, or your header in the product contains some special characters.

  • Is there any way to debug this? As far as I know headers are validated in Zend's GenericHeader class. But we cannot override it to add logs.
    – GenZ Dev
    Jun 16, 2021 at 6:15
  • We just removed all the content of the product and added back and it resolved the issue. I think there were invisible spaces added while creating the product. For someone who is facing this I recommend to create the product again,
    – GenZ Dev
    Jun 16, 2021 at 10:05

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