diff --git a/csharp/App/Backend/Model/User.cs b/csharp/App/Backend/Model/User.cs
index 762c819a4..b206423c2 100644
--- a/csharp/App/Backend/Model/User.cs
+++ b/csharp/App/Backend/Model/User.cs
@@ -5,11 +5,11 @@ namespace InnovEnergy.App.Backend.Model;
 public class User : TreeNode
 {
     [Indexed]                   
-    public String  Email          { get; set; } = "";
-    public Boolean HasWriteAccess { get; set; }
-    public String  S3Key          { get; set; }
-    public String  Salt           { get; set; }
-    public String  Password       { get; set; }
+    public String  Email          { get; set; } = null!;
+    public Boolean HasWriteAccess { get; set; } = false;
+    public String  S3Key          { get; set; } = null!;
+    public String  Salt           { get; set; } = null!;
+    public String  Password       { get; set; } = null!;
     
     // TODO: must reset pwd
 }