diff --git a/MtApi5/MqlParam.cs b/MtApi5/MqlParam.cs
index 5db389c0..08d7a861 100644
--- a/MtApi5/MqlParam.cs
+++ b/MtApi5/MqlParam.cs
@@ -3,8 +3,8 @@
     public class MqlParam
     {
         public ENUM_DATATYPE DataType { get; set; }
-        public long? IntegerValue { get; set; }
-        public double? DoubleValue { get; set; }
-        public string? StringValue { get; set; }
+        public long IntegerValue { get; set; } = 0;
+        public double DoubleValue { get; set; } = 0.0;
+        public string StringValue { get; set; } = String.Empty;
     }
 }