From 1dd6036765f08892a39530ad73f5b046afbdaaaf Mon Sep 17 00:00:00 2001
From: BaronGreenback <jimcartlidge@yahoo.co.uk>
Date: Wed, 10 Mar 2021 19:56:33 +0000
Subject: Fixed false starts

---
 RSSDP/SsdpDeviceLocator.cs | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

(limited to 'RSSDP/SsdpDeviceLocator.cs')

diff --git a/RSSDP/SsdpDeviceLocator.cs b/RSSDP/SsdpDeviceLocator.cs
index e2b524cf46..9a110683e5 100644
--- a/RSSDP/SsdpDeviceLocator.cs
+++ b/RSSDP/SsdpDeviceLocator.cs
@@ -27,14 +27,15 @@ namespace Rssdp.Infrastructure
         /// </summary>
         public SsdpDeviceLocator(ISsdpCommunicationsServer communicationsServer)
         {
-            _CommunicationsServer = communicationsServer;
-
-            if (communicationsServer != null)
+            if (communicationsServer == null)
             {
-                // This can occur is dlna is enabled, but defined to run over https.
-                _CommunicationsServer.ResponseReceived += CommsServer_ResponseReceived;
+                throw new ArgumentNullException(nameof(communicationsServer));
             }
+            
+            _CommunicationsServer = communicationsServer;
 
+            // This can occur is dlna is enabled, but defined to run over https.
+            _CommunicationsServer.ResponseReceived += CommsServer_ResponseReceived;
             _Devices = new List<DiscoveredSsdpDevice>();
         }
 
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