diff --git a/src/Bot/Model/Entity/Chat/Chat.php b/src/Bot/Model/Entity/Chat/Chat.php
index 8058412..35abaaa 100644
--- a/src/Bot/Model/Entity/Chat/Chat.php
+++ b/src/Bot/Model/Entity/Chat/Chat.php
@@ -120,9 +120,9 @@ class Chat implements ModelInterface
     private $lastActivity;
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getId(): string
+    public function getId(): ?string
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Entity/Chat/ChatLastMessage.php b/src/Bot/Model/Entity/Chat/ChatLastMessage.php
index 9b1f439..5dbba92 100644
--- a/src/Bot/Model/Entity/Chat/ChatLastMessage.php
+++ b/src/Bot/Model/Entity/Chat/ChatLastMessage.php
@@ -56,9 +56,9 @@ class ChatLastMessage implements ModelInterface
     private $type;
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getId(): int
+    public function getId(): ?int
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Entity/Chat/ChatMember.php b/src/Bot/Model/Entity/Chat/ChatMember.php
index 4d742ac..bb0ffe4 100644
--- a/src/Bot/Model/Entity/Chat/ChatMember.php
+++ b/src/Bot/Model/Entity/Chat/ChatMember.php
@@ -90,9 +90,9 @@ class ChatMember implements ModelInterface
     private $state;
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getId(): string
+    public function getId(): ?string
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Entity/Message/Item.php b/src/Bot/Model/Entity/Message/Item.php
index 1859410..48dbf32 100644
--- a/src/Bot/Model/Entity/Message/Item.php
+++ b/src/Bot/Model/Entity/Message/Item.php
@@ -58,7 +58,7 @@ class Item implements ModelInterface
     /**
      * @return string
      */
-    public function getId()
+    public function getId(): ?string
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Entity/Message/Message.php b/src/Bot/Model/Entity/Message/Message.php
index 0f56c52..9426551 100644
--- a/src/Bot/Model/Entity/Message/Message.php
+++ b/src/Bot/Model/Entity/Message/Message.php
@@ -209,9 +209,9 @@ class Message implements ModelInterface
     private $product;
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getId(): string
+    public function getId(): ?string
     {
         return $this->id;
     }
@@ -257,9 +257,9 @@ class Message implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getActions(): string
+    public function getActions(): ?string
     {
         return $this->actions;
     }
diff --git a/src/Bot/Model/Entity/Message/MessageProduct.php b/src/Bot/Model/Entity/Message/MessageProduct.php
index a4d0674..717c554 100644
--- a/src/Bot/Model/Entity/Message/MessageProduct.php
+++ b/src/Bot/Model/Entity/Message/MessageProduct.php
@@ -92,9 +92,9 @@ class MessageProduct implements ModelInterface
     private $quantity;
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getId(): int
+    public function getId(): ?int
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Request/CommonFields.php b/src/Bot/Model/Request/CommonFields.php
index 35e9d7e..7fc5b31 100644
--- a/src/Bot/Model/Request/CommonFields.php
+++ b/src/Bot/Model/Request/CommonFields.php
@@ -55,9 +55,9 @@ trait CommonFields
     private $until;
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getId()
+    public function getId(): ?int
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Request/MessageEditRequest.php b/src/Bot/Model/Request/MessageEditRequest.php
index ae20519..4858d85 100644
--- a/src/Bot/Model/Request/MessageEditRequest.php
+++ b/src/Bot/Model/Request/MessageEditRequest.php
@@ -47,9 +47,9 @@ class MessageEditRequest implements ModelInterface
     private $content;
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getId()
+    public function getId(): ?int
     {
         return $this->id;
     }
diff --git a/src/Bot/Model/Response/AssignResponse.php b/src/Bot/Model/Response/AssignResponse.php
index ebaa040..6b7b897 100644
--- a/src/Bot/Model/Response/AssignResponse.php
+++ b/src/Bot/Model/Response/AssignResponse.php
@@ -68,9 +68,9 @@ class AssignResponse implements ModelInterface
     private $responsible;
 
     /**
-     * @return bool
+     * @return bool|null
      */
-    public function getIsReassign(): bool
+    public function getIsReassign(): ?bool
     {
         return $this->isReassign;
     }
@@ -84,9 +84,9 @@ class AssignResponse implements ModelInterface
     }
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getLeftManagerId(): int
+    public function getLeftManagerId(): ?int
     {
         return $this->leftManagerId;
     }
@@ -100,9 +100,9 @@ class AssignResponse implements ModelInterface
     }
 
     /**
-     * @return Responsible
+     * @return Responsible|null
      */
-    public function getPreviousResponsible(): Responsible
+    public function getPreviousResponsible(): ?Responsible
     {
         return $this->previousResponsible;
     }
@@ -116,9 +116,9 @@ class AssignResponse implements ModelInterface
     }
 
     /**
-     * @return Responsible
+     * @return Responsible|null
      */
-    public function getResponsible(): Responsible
+    public function getResponsible(): ?Responsible
     {
         return $this->responsible;
     }
diff --git a/src/Bot/Model/Response/CommonFields.php b/src/Bot/Model/Response/CommonFields.php
index 162f5d9..ce3654c 100644
--- a/src/Bot/Model/Response/CommonFields.php
+++ b/src/Bot/Model/Response/CommonFields.php
@@ -44,9 +44,9 @@ trait CommonFields
     private $statusCode;
 
     /**
-     * @return array
+     * @return array|null
      */
-    public function getErrors(): array
+    public function getErrors(): ?array
     {
         return empty($this->errors) ? [] : $this->errors;
     }
@@ -60,9 +60,9 @@ trait CommonFields
     }
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getStatusCode(): int
+    public function getStatusCode(): ?int
     {
         return $this->statusCode;
     }
diff --git a/src/Bot/Model/Response/FullFileResponse.php b/src/Bot/Model/Response/FullFileResponse.php
index 877ae19..046a0cb 100644
--- a/src/Bot/Model/Response/FullFileResponse.php
+++ b/src/Bot/Model/Response/FullFileResponse.php
@@ -67,9 +67,9 @@ class FullFileResponse implements ModelInterface
     private $url;
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getId(): string
+    public function getId(): ?string
     {
         return $this->id;
     }
@@ -83,9 +83,9 @@ class FullFileResponse implements ModelInterface
     }
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getSize(): int
+    public function getSize(): ?int
     {
         return $this->size;
     }
@@ -99,9 +99,9 @@ class FullFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getType(): string
+    public function getType(): ?string
     {
         return $this->type;
     }
@@ -115,9 +115,9 @@ class FullFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getUrl(): string
+    public function getUrl(): ?string
     {
         return $this->url;
     }
diff --git a/src/Bot/Model/Response/MessageSendResponse.php b/src/Bot/Model/Response/MessageSendResponse.php
index 2e361db..34ac5ea 100644
--- a/src/Bot/Model/Response/MessageSendResponse.php
+++ b/src/Bot/Model/Response/MessageSendResponse.php
@@ -49,9 +49,9 @@ class MessageSendResponse implements ModelInterface
     private $time;
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getMessageId(): int
+    public function getMessageId(): ?int
     {
         return $this->messageId;
     }
@@ -65,9 +65,9 @@ class MessageSendResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getTime(): string
+    public function getTime(): ?string
     {
         return $this->time;
     }
diff --git a/src/Bot/Model/Response/UploadFileResponse.php b/src/Bot/Model/Response/UploadFileResponse.php
index 1866465..c439bd0 100644
--- a/src/Bot/Model/Response/UploadFileResponse.php
+++ b/src/Bot/Model/Response/UploadFileResponse.php
@@ -104,9 +104,9 @@ class UploadFileResponse implements ModelInterface
     private $type;
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getCreatedAt(): string
+    public function getCreatedAt(): ?string
     {
         return $this->createdAt;
     }
@@ -120,9 +120,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getHash(): string
+    public function getHash(): ?string
     {
         return $this->hash;
     }
@@ -136,9 +136,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getId(): string
+    public function getId(): ?string
     {
         return $this->id;
     }
@@ -152,9 +152,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return FileMeta
+     * @return FileMeta|null
      */
-    public function getMeta(): FileMeta
+    public function getMeta(): ?FileMeta
     {
         return $this->meta;
     }
@@ -168,9 +168,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getMimeType(): string
+    public function getMimeType(): ?string
     {
         return $this->mimeType;
     }
@@ -184,9 +184,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return int
+     * @return int|null
      */
-    public function getSize(): int
+    public function getSize(): ?int
     {
         return $this->size;
     }
@@ -200,9 +200,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getSourceUrl(): string
+    public function getSourceUrl(): ?string
     {
         return $this->sourceUrl;
     }
@@ -216,9 +216,9 @@ class UploadFileResponse implements ModelInterface
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getType(): string
+    public function getType(): ?string
     {
         return $this->type;
     }