From 4f7ad4ccb9eacae75d692d26329ba54129a943ef Mon Sep 17 00:00:00 2001
From: Neil Dorin <ndorin@pepperdash.com>
Date: Mon, 8 Feb 2021 15:43:04 -0700
Subject: [PATCH] fixes #599 by checking for registration status before
 updating feedbacks

---
 .../Crestron/CrestronGenericBaseDevice.cs                   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Crestron/CrestronGenericBaseDevice.cs b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Crestron/CrestronGenericBaseDevice.cs
index 56b36791..df2c3c56 100644
--- a/essentials-framework/Essentials Core/PepperDashEssentialsBase/Crestron/CrestronGenericBaseDevice.cs	
+++ b/essentials-framework/Essentials Core/PepperDashEssentialsBase/Crestron/CrestronGenericBaseDevice.cs	
@@ -130,6 +130,12 @@ namespace PepperDash.Essentials.Core
 		void Hardware_OnlineStatusChange(GenericBase currentDevice, OnlineOfflineEventArgs args)
 		{
             Debug.Console(2, this, "OnlineStatusChange Event.  Online = {0}", args.DeviceOnLine);
+
+            if (!Hardware.Registered)
+            {
+                return;  // protects in cases where device has been unregistered and feedbacks would attempt to access null sigs.
+            }
+
             foreach (var feedback in Feedbacks)
             {
                 if (feedback != null)