From 08fe408dc1f1736dfb8d67c23b23de7e3e5c31b0 Mon Sep 17 00:00:00 2001
From: Maxim Batourine <m.batourine@gmail.com>
Date: Thu, 7 Jan 2021 19:31:24 -0500
Subject: [PATCH] Add safety check for casting device into interface

(device as IRoutingInputsOutputs).InputPorts will throw Exception on accessing InputPorts property if device do not implement such interface.
---
 .../PepperDashEssentialsBase/Devices/DeviceManager.cs       | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Devices/DeviceManager.cs b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Devices/DeviceManager.cs
index 0e4efa10..55bc523a 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Devices/DeviceManager.cs	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Devices/DeviceManager.cs	
@@ -360,9 +360,9 @@ namespace PepperDash.Essentials.Core
 	    {
 	        var device = GetDeviceForKey(s);
 
-	        if (device == null) return;
-	        var inputPorts = (device as IRoutingInputsOutputs).InputPorts;
-	        var outputPorts = (device as IRoutingInputsOutputs).OutputPorts;
+            if (device == null) return;
+            var inputPorts = ((device as IRoutingInputs) != null) ? (device as IRoutingInputs).InputPorts : null;
+            var outputPorts = ((device as IRoutingOutputs) != null) ? (device as IRoutingOutputs).OutputPorts : null;
 	        if (inputPorts != null)
 	        {
 	            Debug.Console(0, "Device {0} has {1} Input Ports:", s, inputPorts.Count);