diff --git a/api/models/authentication/RegistrationForm.php b/api/models/authentication/RegistrationForm.php
index 776da8f..fea1245 100644
--- a/api/models/authentication/RegistrationForm.php
+++ b/api/models/authentication/RegistrationForm.php
@@ -16,6 +16,7 @@ use Ramsey\Uuid\Uuid;
 use Yii;
 use yii\base\ErrorException;
 use yii\base\InvalidConfigException;
+use yii\helpers\ArrayHelper;
 use const common\LATEST_RULES_VERSION;
 
 class RegistrationForm extends ApiForm {
@@ -48,6 +49,7 @@ class RegistrationForm extends ApiForm {
             ['rePassword', 'validatePasswordAndRePasswordMatch'],
 
             ['lang', LanguageValidator::class],
+            ['lang', 'default', 'value' => 'en'],
         ];
     }
 
@@ -80,7 +82,7 @@ class RegistrationForm extends ApiForm {
      * @throws Exception
      */
     public function signup() {
-        if (!$this->validate()) {
+        if (!$this->validate() && !$this->canContinue($this->getFirstErrors())) {
             return null;
         }
 
@@ -95,7 +97,7 @@ class RegistrationForm extends ApiForm {
             $account->status = Account::STATUS_REGISTERED;
             $account->rules_agreement_version = LATEST_RULES_VERSION;
             $account->setRegistrationIp(Yii::$app->request->getUserIP());
-            if (!$account->save()) {
+            if (!$account->save(false)) {
                 throw new ErrorException('Account not created.');
             }
 
@@ -157,4 +159,43 @@ class RegistrationForm extends ApiForm {
         }
     }
 
+    /**
+     * Метод проверяет, можно ли занять указанный при регистрации ник или e-mail. Так случается,
+     * что пользователи вводят неправильный e-mail или ник, после замечают это и пытаются вновь
+     * выпонить регистрацию. Мы не будем им мешать и просто удаляем существующие недозарегистрированные
+     * аккаунты, позволяя им зарегистрироваться.
+     *
+     * @param array $errors массив, где ключ - это поле, а значение - первая ошибка из нашего
+     * стандартного словаря ошибок
+     *
+     * @return bool
+     */
+    protected function canContinue(array $errors) : bool {
+        if (ArrayHelper::getValue($errors, 'username') === E::USERNAME_NOT_AVAILABLE) {
+            $duplicatedUsername = Account::findOne([
+                'username' => $this->username,
+                'status' => Account::STATUS_REGISTERED,
+            ]);
+
+            if ($duplicatedUsername !== null) {
+                $duplicatedUsername->delete();
+                unset($errors['username']);
+            }
+        }
+
+        if (ArrayHelper::getValue($errors, 'email') === E::EMAIL_NOT_AVAILABLE) {
+            $duplicatedEmail = Account::findOne([
+                'email' => $this->email,
+                'status' => Account::STATUS_REGISTERED,
+            ]);
+
+            if ($duplicatedEmail !== null) {
+                $duplicatedEmail->delete();
+                unset($errors['email']);
+            }
+        }
+
+        return empty($errors);
+    }
+
 }
diff --git a/api/models/profile/ChangeLanguageForm.php b/api/models/profile/ChangeLanguageForm.php
index fa44d26..391687a 100644
--- a/api/models/profile/ChangeLanguageForm.php
+++ b/api/models/profile/ChangeLanguageForm.php
@@ -31,7 +31,7 @@ class ChangeLanguageForm extends ApiForm {
 
         $account = $this->getAccount();
         $account->lang = $this->lang;
-        if (!$account->save()) {
+        if (!$account->save(false)) {
             throw new ErrorException('Cannot change user language');
         }
 
diff --git a/common/models/Account.php b/common/models/Account.php
index 4227e9d..4c94f08 100644
--- a/common/models/Account.php
+++ b/common/models/Account.php
@@ -3,7 +3,6 @@ namespace common\models;
 
 use common\helpers\Error as E;
 use common\components\UserPass;
-use common\validators\LanguageValidator;
 use Ely\Yii2\TempmailValidator;
 use Yii;
 use yii\base\InvalidConfigException;
@@ -79,9 +78,6 @@ class Account extends ActiveRecord {
             [['email'], 'email', 'checkDNS' => true, 'enableIDN' => true, 'message' => E::EMAIL_INVALID],
             [['email'], TempmailValidator::class, 'message' => E::EMAIL_IS_TEMPMAIL],
             [['email'], 'unique', 'message' => E::EMAIL_NOT_AVAILABLE],
-
-            [['lang'], LanguageValidator::class],
-            [['lang'], 'default', 'value' => 'en'],
         ];
     }
 
diff --git a/tests/codeception/api/functional/RegisterCest.php b/tests/codeception/api/functional/RegisterCest.php
index 210afb3..4730d8f 100644
--- a/tests/codeception/api/functional/RegisterCest.php
+++ b/tests/codeception/api/functional/RegisterCest.php
@@ -1,7 +1,6 @@
 <?php
 namespace tests\codeception\api\functional;
 
-use Codeception\Specify;
 use common\models\Account;
 use tests\codeception\api\_pages\SignupRoute;
 use tests\codeception\api\FunctionalTester;
@@ -216,6 +215,40 @@ class RegisterCest {
             'rulesAgreement' => true,
             'lang' => 'ru',
         ]);
+        $this->assertSuccessRegistration($I);
+    }
+
+    public function testUserCorrectRegistrationWithReassignUsername(FunctionalTester $I) {
+        $route = new SignupRoute($I);
+
+        $I->wantTo('ensure that signup allow reassign not finished registration username');
+        $route->register([
+            'username' => 'howe.garnett',
+            'email' => 'custom-email@gmail.com',
+            'password' => 'some_password',
+            'rePassword' => 'some_password',
+            'rulesAgreement' => true,
+            'lang' => 'ru',
+        ]);
+        $this->assertSuccessRegistration($I);
+    }
+
+    public function testUserCorrectRegistrationWithReassignEmail(FunctionalTester $I) {
+        $route = new SignupRoute($I);
+
+        $I->wantTo('ensure that signup allow reassign not finished registration email');
+        $route->register([
+            'username' => 'CustomUsername',
+            'email' => 'achristiansen@gmail.com',
+            'password' => 'some_password',
+            'rePassword' => 'some_password',
+            'rulesAgreement' => true,
+            'lang' => 'ru',
+        ]);
+        $this->assertSuccessRegistration($I);
+    }
+
+    private function assertSuccessRegistration(FunctionalTester $I) {
         $I->canSeeResponseCodeIs(200);
         $I->canSeeResponseIsJson();
         $I->canSeeResponseContainsJson(['success' => true]);