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Github fixI found the solution for anyone else having this error in debug mode. It did not fix my overall problem, but now the error is gone in debug. 

src/PrestaShopBundle/Entity/Tab.php 

@@ -109,7 +109,7 @@ class Tab

private $icon;

/**

* @ORM\OneToMany(targetEntity="PrestaShopBundle\Entity\TabLang", mappedBy="tab")

Quote

* @ORM\OneToMany(targetEntity="PrestaShopBundle\Entity\TabLang", mappedBy="id") 

*/

private $tabLangs;

I found the solution for anyone else having this error in debug mode. It did not fix my overall problem, but now the error is gone in debug. 

src/PrestaShopBundle/Entity/Tab.php 

@@ -109,7 +109,7 @@ class Tab

private $icon;

/**

* @ORM\OneToMany(targetEntity="PrestaShopBundle\Entity\TabLang", mappedBy="tab")

Quote

* @ORM\OneToMany(targetEntity="PrestaShopBundle\Entity\TabLang", mappedBy="id") 

*/

private $tabLangs;

Fix tab entity tabLangs variable mapping by aleksiuno · Pull Request #21218 · PrestaShop/PrestaShop · GitHub