Presta Shop errors on registration

Question

recently I made SEO optimization for client of mine, and I had to change some things on the server, like use PHP 7 and in Presta Shop admin panel to enable caching and SEO links. I don`t use Presta Shop and I am not familiar with it, but some of this changes broke something in the code. When new user tries to registrate it gets that error :

Fatal error: Uncaught Error: Access to undeclared static property: Validate::$data in /home/unikalna/public_html/classes/ObjectModel.php:1032 Stack trace: #0 /home/unikalna/public_html/controllers/front/AuthController.php(406): ObjectModelCore->validateController() #1 /home/unikalna/public_html/controllers/front/AuthController.php(252): AuthControllerCore->processSubmitAccount() #2 /home/unikalna/public_html/classes/controller/Controller.php(171): AuthControllerCore->postProcess() #3 /home/unikalna/public_html/classes/Dispatcher.php(373): ControllerCore->run() #4 /home/unikalna/public_html/index.php(28): DispatcherCore->dispatch() #5 {main} thrown in /home/unikalna/public_html/classes/ObjectModel.php on line 1032

And also if its already registered and tries to buy something.

Version :PrestaShop™ 1.6.0.6

Solved : Presta Shop 1.6 don`t work with PHP 7

Answer 1

/home/unikalna/public_html/classes/ObjectModel.php:1032

OLD CODE

if (!empty($value) || $value === '0' || ($field == 'postcode' && $value == '0')) {
    if (isset($data['validate']) && !Validate::$data['validate']($value) && (!empty($value) || $data['required'])) {
                $errors[$field] = '<b>'.self::displayFieldName($field, get_class($this), $htmlentities).'</b> '.Tools::displayError('is invalid.');
            } else {
                if (isset($data['copy_post']) && !$data['copy_post']) {
                    continue;
                }
                if ($field == 'passwd') {
                    if ($value = Tools::getValue($field)) {
                        $this->{$field} = Tools::encrypt($value);
                    }
                } else {
                    $this->{$field} = $value;
                }
            }
        }

Replace with below code block

NEW CODE

if (!empty($value) || $value === '0' || ($field == 'postcode' && $value == '0')) {
   if (isset($data['validate']) && !call_user_func('Validate::'.$data['validate'],$value) && (!empty($value) || $data['required'])) {
    $errors[$field] = '<b>'.self::displayFieldName($field, get_class($this), $htmlentities).'</b> '.Tools::displayError('is invalid.');
            } else {
                if (isset($data['copy_post']) && !$data['copy_post']) {
                    continue;
                }
                if ($field == 'passwd') {
                    if ($value = Tools::getValue($field)) {
                        $this->{$field} = Tools::encrypt($value);
                    }
                } else {
                    $this->{$field} = $value;
                }
            }
        }