I have the same problem.
In debug mode, I got this:
[PrestaShopException]
Свойство Address->phone_mobile е празно.
at line 944 in file classes/ObjectModel.php
939. }
940.
941. $message = $this->validateField($field, $this->$field);
942. if ($message !== true) {
943. if ($die) {
944. throw new PrestaShopException($message);
945. }
946. return $error_return ? $message : false;
947. }
948. }
949.
ObjectModelCore->validateFields - [line 272 - classes/ObjectModel.php]
ObjectModelCore->getFields - [line 48 - classes/AddressChecksumCore.php]
AddressChecksumCore->generateChecksum - [line 52 - classes/checkout/CartChecksum.php] - [1 Arguments]
CartChecksumCore->generateChecksum - [line 171 - controllers/front/OrderController.php] - [1 Arguments]
OrderControllerCore->restorePersistedData - [line 199 - controllers/front/OrderController.php] - [1 Arguments]
OrderControllerCore->initContent - [line 205 - classes/controller/Controller.php]
ControllerCore->run - [line 379 - classes/Dispatcher.php]
DispatcherCore->dispatch - [line 28 - index.php]