diff --git a/Sources/Stim.Model/User.cs b/Sources/Stim.Model/User.cs
index 28c6f02..640f649 100644
--- a/Sources/Stim.Model/User.cs
+++ b/Sources/Stim.Model/User.cs
@@ -32,7 +32,7 @@ namespace Model
             private set
             {
                 Regex rg_email = new Regex("^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]{2,4}$");
-                if (string.IsNullOrWhiteSpace(value) && rg_email.IsMatch(value))
+                if (!string.IsNullOrWhiteSpace(value) && rg_email.IsMatch(value))
                     email = value;
                 return;
             }