diff --git a/NETGenerator/NETGenerator.cs b/NETGenerator/NETGenerator.cs
index b969e6600..21e74d1b9 100644
--- a/NETGenerator/NETGenerator.cs
+++ b/NETGenerator/NETGenerator.cs
@@ -1390,7 +1390,9 @@ namespace PascalABCCompiler.NETGenerator
         {
             FieldBuilder fb = cur_type.DefineField(name, helper.GetTypeReference(type).tp, FieldAttributes.Static | FieldAttributes.Public | FieldAttributes.Literal);
             Type t = helper.GetTypeReference(type).tp;
-            if (!t.Name.StartsWith("NewSet") && t.IsEnum) // SSM 05.11.24
+
+			// Для инстанцированных generic типов вызов .IsEnum приводит к исключению
+			if (!t.IsConstructedGenericType() && t.IsEnum)
             {
                 if (!(t is EnumBuilder))
                     fb.SetConstant(Enum.ToObject(t, (constant_value as IEnumConstNode).constant_value));
diff --git a/NETGenerator/TypeExt.cs b/NETGenerator/TypeExt.cs
new file mode 100644
index 000000000..7eb583fd4
--- /dev/null
+++ b/NETGenerator/TypeExt.cs
@@ -0,0 +1,15 @@
+using System;
+
+namespace PascalABCCompiler.NETGenerator
+{
+	internal static class TypeExt
+	{
+		/// <summary>
+		/// Повторяет работу свойства System.Type.IsConstructedGenericType из net fx 4.5
+		/// </summary>
+		public static bool IsConstructedGenericType(this Type t)
+		{
+			return t.IsGenericType && !t.IsGenericTypeDefinition;
+		}
+	}
+}