diff --git a/src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/UnavailableValue.cs b/src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/UnavailableValue.cs
index 45ca0202f8..b902a87784 100644
--- a/src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/UnavailableValue.cs
+++ b/src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/UnavailableValue.cs
@@ -33,7 +33,7 @@ namespace Debugger
 			
 		}
 		
-		internal UnavailableValue(NDebugger debugger, string message):base(debugger, null)
+		internal UnavailableValue(NDebugger debugger, string message):base(debugger, new PersistentCorValue(debugger, null))
 		{
 			this.message = message;
 		}