diff --git a/essentials-framework/Essentials DM/Essentials_DM/Chassis/DmpsRoutingController.cs b/essentials-framework/Essentials DM/Essentials_DM/Chassis/DmpsRoutingController.cs
index 074880e6..17aa1b1d 100644
--- a/essentials-framework/Essentials DM/Essentials_DM/Chassis/DmpsRoutingController.cs	
+++ b/essentials-framework/Essentials DM/Essentials_DM/Chassis/DmpsRoutingController.cs	
@@ -1357,7 +1357,7 @@ namespace PepperDash.Essentials.DM
                 else if (inputSelector <= Dmps.SwitcherInputs.Count && outputSelector <= Dmps.SwitcherOutputs.Count)
                 {
                     var output = Dmps.SwitcherOutputs[outputSelector] as DMOutput;
-                    var input = Dmps.SwitcherInputs[inputSelector] as DMInput;
+                    var input = inputSelector == 0 ? null : Dmps.SwitcherInputs[inputSelector] as DMInput;
                     output.AudioOut = input;
                 }
             }