diff --git a/src/Serializer.php b/src/Serializer.php
index c8c6075..86f4902 100644
--- a/src/Serializer.php
+++ b/src/Serializer.php
@@ -73,8 +73,11 @@ class Serializer
         if ($context instanceof DeserializationContext) {
             switch ($from) {
                 case self::S_ARRAY:
+                    $filtered = array_filter($data, static function ($el) {
+                        return isset($el);
+                    });
                     $deserialized = $serializer
-                        ->fromArray(array_filter($data), self::normalizeNamespace($entityType), $context);
+                        ->fromArray($filtered, self::normalizeNamespace($entityType), $context);
                     break;
                 case self::S_JSON:
                     $deserialized = $serializer
diff --git a/tests/Bot/Tests/Model/MessageTest.php b/tests/Bot/Tests/Model/MessageTest.php
new file mode 100644
index 0000000..a3fe55a
--- /dev/null
+++ b/tests/Bot/Tests/Model/MessageTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace RetailCrm\Mg\Bot\Tests\Model;
+
+use RetailCrm\Common\Serializer;
+use RetailCrm\Mg\Bot\Model\Entity\Message\Message;
+use PHPUnit\Framework\TestCase;
+
+class MessageTest extends TestCase
+{
+    /**
+     * @dataProvider dataProvider_noContent
+     * @param $content
+     */
+    public function testDeserialization_NoContent($content): void
+    {
+        $item = ['content' => $content];
+
+        /** @var Message $result */
+        $result = Serializer::deserialize($item, Message::class, Serializer::S_ARRAY);
+
+        self::assertNull($result->getContent());
+    }
+
+    /**
+     * @dataProvider dataProvider_withContent
+     * @param $content
+     */
+    public function testDeserialization_WithContent($content): void
+    {
+        $item = ['content' => $content];
+
+        /** @var Message $result */
+        $result = Serializer::deserialize($item, Message::class, Serializer::S_ARRAY);
+
+        self::assertNotNull($result->getContent());
+        self::assertEquals($content, $result->getContent());
+    }
+
+    public function dataProvider_noContent(): array
+    {
+        return [
+            [null],
+        ];
+    }
+
+    public function dataProvider_withContent(): array
+    {
+        return [
+            [''],
+            ['0'],
+            ['Something'],
+        ];
+    }
+}