diff --git a/src/Entity/MobileSession.php b/src/Entity/MobileSession.php
index 25d6df8b..48dfcc79 100644
--- a/src/Entity/MobileSession.php
+++ b/src/Entity/MobileSession.php
@@ -51,13 +51,13 @@ class MobileSession
 
     // phone number
     /**
-     *@ORM\Column(type="string", length=12)
+     *@ORM\Column(type="string", length=12, nullable=true)
      */
     protected $phone_number;
 
     // confirm code that we send via SMS
     /**
-     *@ORM\Column(type="string", length=6)
+     *@ORM\Column(type="string", length=6, nullable=true)
      */
     protected $confirm_code;