From e497aa8fb4bc2eea6b2cb2b3b9ca5710bee27d7b Mon Sep 17 00:00:00 2001
From: "David R. Williamson" <drwill@microsoft.com>
Date: Mon, 3 Jan 2022 13:58:36 -0800
Subject: [PATCH] fix(iot-svc): update debug assert

---
 iothub/device/src/IotHubConnectionString.Core.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/iothub/device/src/IotHubConnectionString.Core.cs b/iothub/device/src/IotHubConnectionString.Core.cs
index 70edd63dd0..543ea47c5f 100644
--- a/iothub/device/src/IotHubConnectionString.Core.cs
+++ b/iothub/device/src/IotHubConnectionString.Core.cs
@@ -19,11 +19,14 @@ Task<string> IAuthorizationProvider.GetPasswordAsync()
                 if (Logging.IsEnabled)
                     Logging.Enter(this, $"{nameof(IotHubConnectionString)}.{nameof(IAuthorizationProvider.GetPasswordAsync)}");
 
-                Debug.Assert(TokenRefresher != null);
+                Debug.Assert(
+                    !string.IsNullOrWhiteSpace(SharedAccessSignature)
+                        || TokenRefresher != null,
+                    "The token refresher and the shared access signature can't both be null");
 
                 return !string.IsNullOrWhiteSpace(SharedAccessSignature)
                     ? Task.FromResult(SharedAccessSignature)
-                    : TokenRefresher.GetTokenAsync(Audience);
+                    : TokenRefresher?.GetTokenAsync(Audience);
             }
             finally
             {