diff --git a/UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerClient.cs b/UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerClient.cs
index 1972064..6c752f4 100644
--- a/UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerClient.cs
+++ b/UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerClient.cs
@@ -31,7 +31,7 @@ public class NetDebuggerClient : IDebuggerClient, IDisposable
     public event Action<string> DispatcherStep;
     public event Action<InterpreterCommand> InterpreterStateChanged;
 
-    public NetDebuggerClient(string connectionUri) : this(new Uri(connectionUri))
+    public NetDebuggerClient(string connectionUri) : this(connectionUri is null ? null : new Uri(connectionUri))
     {
     }