This problem maybe related with prestashop system
Try this changes:
1. /controllers/front/AuthController.php - line 55 - 61
replace code:
$hookResult = array_reduce(
Hook::exec('actionSubmitAccountBefore', array(), null, true),
function ($carry, $item) {
return $carry && $item;
},
true
);
on the:
$actionSubmitAccountBefore = Hook::exec('actionSubmitAccountBefore', array(), null, true);
if(strlen($actionSubmitAccountBefore)==0){
$actionSubmitAccountBefore = array();
}
$hookResult = array_reduce(
$actionSubmitAccountBefore,
function ($carry, $item) {
return $carry && $item;
},
true
);
SPM
Buy on 
