impossible to activate modules

Hello.

I wanted to activate the isotope module on a website with Drupal 7.59 (I’ve just upgraded to 7.59), but when I click on  ” save the configuration” (in french “enregistrer la configuration”), nothing happens…I just have a blank page !

Any idea ?

Anne

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/21/feed