diff --git a/api/modules/internal/models/BlockForm.php b/api/modules/internal/models/BlockForm.php
index a60b757..7cb0bdb 100644
--- a/api/modules/internal/models/BlockForm.php
+++ b/api/modules/internal/models/BlockForm.php
@@ -7,6 +7,7 @@ use common\models\Account;
 use common\models\amqp\AccountBanned;
 use PhpAmqpLib\Message\AMQPMessage;
 use Yii;
+use yii\base\ErrorException;
 
 class BlockForm extends ApiForm {
 
@@ -27,7 +28,7 @@ class BlockForm extends ApiForm {
      *
      * @var string
      */
-    public $message;
+    public $message = '';
 
     /**
      * @var Account
@@ -50,7 +51,9 @@ class BlockForm extends ApiForm {
 
         $account = $this->account;
         $account->status = Account::STATUS_BANNED;
-        $account->save();
+        if (!$account->save()) {
+            throw new ErrorException('Cannot ban account');
+        }
 
         $this->createTask();
 
diff --git a/tests/codeception/api/unit/modules/internal/models/BlockFormTest.php b/tests/codeception/api/unit/modules/internal/models/BlockFormTest.php
new file mode 100644
index 0000000..055eaec
--- /dev/null
+++ b/tests/codeception/api/unit/modules/internal/models/BlockFormTest.php
@@ -0,0 +1,47 @@
+<?php
+namespace tests\codeception\api\unit\modules\internal\models;
+
+use api\modules\internal\models\BlockForm;
+use common\models\Account;
+use tests\codeception\api\unit\TestCase;
+
+class BlockFormTest extends TestCase {
+
+    public function testBan() {
+        /** @var Account|\PHPUnit_Framework_MockObject_MockObject $account */
+        $account = $this->getMockBuilder(Account::class)
+            ->setMethods(['save'])
+            ->getMock();
+
+        $account->expects($this->once())
+            ->method('save')
+            ->willReturn(true);
+
+        $model = new BlockForm($account);
+        $this->assertTrue($model->ban());
+        $this->assertEquals(Account::STATUS_BANNED, $account->status);
+        $this->tester->canSeeAmqpMessageIsCreated('events');
+    }
+
+    public function testCreateTask() {
+        $account = new Account();
+        $account->id = 3;
+
+        $model = new BlockForm($account);
+        $model->createTask();
+        $message = json_decode($this->tester->grabLastSentAmqpMessage('events')->body, true);
+        $this->assertSame(3, $message['accountId']);
+        $this->assertSame(-1, $message['duration']);
+        $this->assertSame('', $message['message']);
+
+        $model = new BlockForm($account);
+        $model->duration = 123;
+        $model->message = 'test';
+        $model->createTask();
+        $message = json_decode($this->tester->grabLastSentAmqpMessage('events')->body, true);
+        $this->assertSame(3, $message['accountId']);
+        $this->assertSame(123, $message['duration']);
+        $this->assertSame('test', $message['message']);
+    }
+
+}