Error 500 - Add new supplier

[AETtec]

Hello, i have suppliers created, but now when i try to create another one i get the next message on debug mode:

[PrestaShopException]
La propiedad Address->dni está vacía.
at line 1004 in file classes/ObjectModel.php

999.             }
1000. 
1001.             $message = $this->validateField($field, $this->$field);
1002.             if ($message !== true) {
1003.                 if ($die) {
1004.                     throw new PrestaShopException($message);
1005.                 }
1006. 
1007.                 return $error_return ? $message : false;
1008.             }
1009.         }
ObjectModelCore->validateFields - [line 292 - classes/ObjectModel.php]
287.      *
288.      * @throws PrestaShopException
289.      */
290.     public function getFields()
291.     {
292.         $this->validateFields();
293.         $fields = $this->formatFields(self::FORMAT_COMMON);
294. 
295.         // For retro compatibility
296.         if (Shop::isTableAssociated($this->def['table'])) {
297.             $fields = array_merge($fields, $this->getFieldsShop());
ObjectModelCore->getFields - [line 561 - classes/ObjectModel.php]
ObjectModelCore->add - [line 187 - classes/Address.php] - [2 Arguments]
182.     /**
183.      * @see ObjectModel::add()
184.      */
185.     public function add($autodate = true, $null_values = false)
186.     {
187.         if (!parent::add($autodate, $null_values)) {
188.             return false;
189.         }
190. 
191.         if (Validate::isUnsignedId($this->id_customer)) {
192.             Customer::resetAddressCache($this->id_customer, $this->id);
AddressCore->add - [line 516 - classes/ObjectModel.php] - [2 Arguments]
511.      *
512.      * @throws PrestaShopException
513.      */
514.     public function save($null_values = false, $auto_date = true)
515.     {
516.         return (int) $this->id > 0 ? $this->update($null_values) : $this->add($auto_date, $null_values);
517.     }
518. 
519.     /**
520.      * Adds current object to the database.
521.      *
ObjectModelCore->save - [line 501 - controllers/admin/AdminSuppliersController.php]
496.                 $this->errors[] = $this->trans('The address is not correct. Please make sure all of the required fields are completed.', array(), 'Admin.Catalog.Notification');
497.             } else {
498.                 if (Tools::isSubmit('id_address') && Tools::getValue('id_address') > 0) {
499.                     $address->update();
500.                 } else {
501.                     $address->save();
502.                     $_POST['id_address'] = $address->id;
503.                 }
504.             }
505. 
506.             return parent::postProcess();
AdminSuppliersControllerCore->postProcess - [line 281 - classes/controller/Controller.php]
276.             if (!$this->content_only && ($this->display_header || (isset($this->className) && $this->className))) {
277.                 $this->setMedia();
278.             }
279. 
280.             // postProcess handles ajaxProcess
281.             $this->postProcess();
282. 
283.             if (!empty($this->redirect_after)) {
284.                 $this->redirect();
285.             }
286. 
ControllerCore->run - [line 515 - classes/Dispatcher.php]
510.             if (isset($params_hook_action_dispatcher)) {
511.                 Hook::exec('actionDispatcher', $params_hook_action_dispatcher);
512.             }
513. 
514.             // Running controller
515.             $controller->run();
516. 
517.             // Execute hook dispatcher after
518.             if (isset($params_hook_action_dispatcher)) {
519.                 Hook::exec('actionDispatcherAfter', $params_hook_action_dispatcher);
520.             }
DispatcherCore->dispatch - [line 97 - admin/index.php]
92.     if (!headers_sent()) {
93.         header('Content-Type: text/html; charset=utf-8');
94.     }
95. 
96.     // Prepare and trigger LEGACY admin dispatcher
97.     Dispatcher::getInstance()->dispatch();
98. }

Cant undestand why, and look at the sentence address -> DNI está vacía (DNI Empty) no exists DNI on supplier form... :S

My PS version is 1.7.6.1. New york Theme

Edited January 9, 2020 by AETtec
More info (see edit history)

[AETtec]

Please need solution 😕 how can i repair it, dont understand why now i got the error but not at the start

[NemoPS]

It looks like the DNI field is mandatory, isn't there an input for that in the supplier? If not, I guess it's a bug, and you have to make it not mandatory, save, then make it mandatory again

[AETtec]

Video added