diff --git a/Domain/Entities/User.cs b/Domain/Entities/User.cs
index a8c24a4..b505ff0 100644
--- a/Domain/Entities/User.cs
+++ b/Domain/Entities/User.cs
@@ -15,7 +15,7 @@ public User()
 		public required string Email { get; set; }
 		public required Provider Provider { get; set; }
 		public required string ProviderKey { get; set; }
-		public string ProviderRefreshToken { get; set; } = null;
+		public string ProviderRefreshToken { get; set; } = string.Empty;
 		public required string Name { get; set; }
 		public bool IsActive { get; set; }
 		public bool IsEmailVerified { get; set; } = false;