Error when trying to do translations

[TimLivin]

Hi,

Our company runs a webshop with Prestashop 1.7. Since a while we receive an error when we are trying to translate stuff in backend. It doesn't matter if I want to translate a theme, a module etc. Always the same error: Warning: reset() expects parameter 1 to be array, null given in /var/www/vhosts/livinflame.com/httpdocs/src/PrestaShopBundle/Twig/TranslationsExtension.phpon line 145

I have very limited coding skills, so I don't have any idea what the problem really is. Is this a common error? Or can someone point me out where to look?

Thanks in advance!