diff --git a/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs b/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
index bbf55d2b..283d11f0 100644
--- a/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
+++ b/EnvelopeGenerator.Domain/Entities/EnvelopeReceiverBase.cs
@@ -50,6 +50,6 @@ namespace EnvelopeGenerator.Domain.Entities
         public (int Envelope, int Receiver) Id => (Envelope: EnvelopeId, Receiver: ReceiverId);
 
         [NotMapped]
-        public bool HasPhoneNumber => PhoneNumber is not null;
+        public bool HasPhoneNumber => !string.IsNullOrWhiteSpace(PhoneNumber);
     }
 }
\ No newline at end of file