diff --git a/src/VkUser.php b/src/VkUser.php
index 452f1b1..c044523 100644
--- a/src/VkUser.php
+++ b/src/VkUser.php
@@ -67,12 +67,12 @@ class VkUser implements ResourceOwnerInterface
     /**
      * Short address to user page
      */
-    public function getDomain(): string
+    public function getDomain(): string|null
     {
         return $this->getField('domain');
     }
     
-    public function getFirstName(): string
+    public function getFirstName(): string|null
     {
         return $this->getField('first_name');
     }
@@ -93,7 +93,7 @@ class VkUser implements ResourceOwnerInterface
         return (bool)$this->getField('has_photo');
     }
     
-    public function getHomeTown(): string
+    public function getHomeTown(): string|null
     {
         return $this->getField('home_town');
     }
@@ -106,17 +106,17 @@ class VkUser implements ResourceOwnerInterface
         return (bool)$this->getField('is_friend');
     }
     
-    public function getLastName(): string
+    public function getLastName(): string|null
     {
         return $this->getField('last_name');
     }
 
-    public function getMaidenName(): string
+    public function getMaidenName(): string|null
     {
         return $this->getField('maiden_name');
     }
 
-    public function getNickname(): string
+    public function getNickname(): string|null
     {
         return $this->getField('nickname');
     }
@@ -128,12 +128,12 @@ class VkUser implements ResourceOwnerInterface
         return $this->getField('photo_max');
     }
 
-    public function getPhotoMaxOrig(): string
+    public function getPhotoMaxOrig(): string|null
     {
         return $this->getField('photo_max_orig');
     }
     
-    public function getScreenName(): string
+    public function getScreenName(): string|null
     {
         return $this->getField('screen_name');
     }
@@ -143,7 +143,7 @@ class VkUser implements ResourceOwnerInterface
         return $this->getField('sex');
     }
 
-    public function getEmail(): string
+    public function getEmail(): string|null
     {
         return $this->getField('email');
     }