diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index f2a189a..6744e8d 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -45,11 +45,6 @@ parameters:
 			count: 1
 			path: src/Bot/Client.php
 
-		-
-			message: "#^Cannot cast Symfony\\\\Component\\\\Validator\\\\ConstraintViolationInterface to string\\.$#"
-			count: 1
-			path: src/Bot/HttpClient.php
-
 		-
 			message: "#^Method RetailCrm\\\\Mg\\\\Bot\\\\HttpClient\\:\\:getErrors\\(\\) has parameter \\$errors with no value type specified in iterable type array\\.$#"
 			count: 1
@@ -1910,46 +1905,11 @@ parameters:
 			count: 1
 			path: src/Register.php
 
-		-
-			message: "#^Method RetailCrm\\\\Common\\\\Serializer\\:\\:normalizeNamespace\\(\\) never returns bool so it can be removed from the return typehint\\.$#"
-			count: 1
-			path: src/Serializer.php
-
 		-
 			message: "#^Method RetailCrm\\\\Common\\\\Serializer\\:\\:serialize\\(\\) return type has no value type specified in iterable type array\\.$#"
 			count: 1
 			path: src/Serializer.php
 
-		-
-			message: "#^Parameter \\#2 \\$context of method JMS\\\\Serializer\\\\Serializer\\:\\:toArray\\(\\) expects JMS\\\\Serializer\\\\SerializationContext\\|null, JMS\\\\Serializer\\\\DeserializationContext\\|JMS\\\\Serializer\\\\SerializationContext given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
-		-
-			message: "#^Parameter \\#2 \\$type of method JMS\\\\Serializer\\\\Serializer\\:\\:deserialize\\(\\) expects string, bool\\|string given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
-		-
-			message: "#^Parameter \\#2 \\$type of method JMS\\\\Serializer\\\\Serializer\\:\\:fromArray\\(\\) expects string, bool\\|string given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
-		-
-			message: "#^Parameter \\#3 \\$context of method JMS\\\\Serializer\\\\Serializer\\:\\:fromArray\\(\\) expects JMS\\\\Serializer\\\\DeserializationContext\\|null, JMS\\\\Serializer\\\\DeserializationContext\\|JMS\\\\Serializer\\\\SerializationContext given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
-		-
-			message: "#^Parameter \\#3 \\$context of method JMS\\\\Serializer\\\\Serializer\\:\\:serialize\\(\\) expects JMS\\\\Serializer\\\\SerializationContext\\|null, JMS\\\\Serializer\\\\DeserializationContext\\|JMS\\\\Serializer\\\\SerializationContext given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
-		-
-			message: "#^Parameter \\#4 \\$context of method JMS\\\\Serializer\\\\Serializer\\:\\:deserialize\\(\\) expects JMS\\\\Serializer\\\\DeserializationContext\\|null, JMS\\\\Serializer\\\\DeserializationContext\\|JMS\\\\Serializer\\\\SerializationContext given\\.$#"
-			count: 1
-			path: src/Serializer.php
-
 		-
 			message: "#^Method RetailCrm\\\\Common\\\\Url\\:\\:buildGetParameters\\(\\) has parameter \\$params with no value type specified in iterable type array\\.$#"
 			count: 1
diff --git a/src/Bot/HttpClient.php b/src/Bot/HttpClient.php
index e750a33..e56f950 100644
--- a/src/Bot/HttpClient.php
+++ b/src/Bot/HttpClient.php
@@ -232,7 +232,7 @@ class HttpClient
             $message = '';
 
             foreach ($errors as $error) {
-                $message .= (string)$error;
+                $message .= $error->getMessage();
             }
 
             throw new InvalidArgumentException($message);
diff --git a/src/Serializer.php b/src/Serializer.php
index 7edee95..c8c6075 100644
--- a/src/Serializer.php
+++ b/src/Serializer.php
@@ -40,14 +40,16 @@ class Serializer
         $serializer = SerializerBuilder::create()->build();
         $context = self::getContext(false);
 
-        switch ($serialize) {
-            case self::S_ARRAY:
-                $serialized = $serializer->toArray($request, $context);
-                break;
-            case self::S_JSON:
-            default:
-                $serialized = $serializer->serialize($request, $serialize, $context);
-                break;
+        if ($context instanceof SerializationContext) {
+            switch ($serialize) {
+                case self::S_ARRAY:
+                    $serialized = $serializer->toArray($request, $context);
+                    break;
+                case self::S_JSON:
+                default:
+                    $serialized = $serializer->serialize($request, $serialize, $context);
+                    break;
+            }
         }
 
         return $serialized;
@@ -68,15 +70,17 @@ class Serializer
         $serializer = SerializerBuilder::create()->build();
         $context = self::getContext(true);
 
-        switch ($from) {
-            case self::S_ARRAY:
-                $deserialized = $serializer
-                    ->fromArray(array_filter($data), self::normalizeNamespace($entityType), $context);
-                break;
-            case self::S_JSON:
-                $deserialized = $serializer
-                    ->deserialize($data, self::normalizeNamespace($entityType), $from, $context);
-                break;
+        if ($context instanceof DeserializationContext) {
+            switch ($from) {
+                case self::S_ARRAY:
+                    $deserialized = $serializer
+                        ->fromArray(array_filter($data), self::normalizeNamespace($entityType), $context);
+                    break;
+                case self::S_JSON:
+                    $deserialized = $serializer
+                        ->deserialize($data, self::normalizeNamespace($entityType), $from, $context);
+                    break;
+            }
         }
 
         return $deserialized instanceof ModelInterface ? $deserialized : new ErrorOnlyResponse();
@@ -103,7 +107,7 @@ class Serializer
     /**
      * @param string $namespace
      *
-     * @return bool|string
+     * @return string
      */
     private static function normalizeNamespace(string $namespace)
     {