From 0bd02a9272d9c762c014754ecb3e475f38fdb044 Mon Sep 17 00:00:00 2001
From: "nicolas.dorier" <nicolas.dorier@gmail.com>
Date: Wed, 27 Mar 2019 18:56:43 +0900
Subject: [PATCH] Fix some exceptions raised if port is already used

---
 .../HostedServices/BackgroundJobSchedulerHostedService.cs       | 2 ++
 BTCPayServer/HostedServices/BaseAsyncService.cs                 | 2 ++
 BTCPayServer/HostedServices/InvoiceWatcher.cs                   | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/BTCPayServer/HostedServices/BackgroundJobSchedulerHostedService.cs b/BTCPayServer/HostedServices/BackgroundJobSchedulerHostedService.cs
index 1689e74af..98e547f80 100644
--- a/BTCPayServer/HostedServices/BackgroundJobSchedulerHostedService.cs
+++ b/BTCPayServer/HostedServices/BackgroundJobSchedulerHostedService.cs
@@ -34,6 +34,8 @@ namespace BTCPayServer.HostedServices
 
         public async Task StopAsync(CancellationToken cancellationToken)
         {
+            if (_Stop == null)
+                return Task.CompletedTask;
             _Stop.Cancel();
             try
             {
diff --git a/BTCPayServer/HostedServices/BaseAsyncService.cs b/BTCPayServer/HostedServices/BaseAsyncService.cs
index 4b8c85512..1bc6ca2ec 100644
--- a/BTCPayServer/HostedServices/BaseAsyncService.cs
+++ b/BTCPayServer/HostedServices/BaseAsyncService.cs
@@ -59,6 +59,8 @@ namespace BTCPayServer.HostedServices
 
         public Task StopAsync(CancellationToken cancellationToken)
         {
+            if (_Cts == null)
+                return Task.CompletedTask;
             _Cts.Cancel();
             return Task.WhenAll(_Tasks);
         }
diff --git a/BTCPayServer/HostedServices/InvoiceWatcher.cs b/BTCPayServer/HostedServices/InvoiceWatcher.cs
index 4e62f3d24..ec413dc2d 100644
--- a/BTCPayServer/HostedServices/InvoiceWatcher.cs
+++ b/BTCPayServer/HostedServices/InvoiceWatcher.cs
@@ -333,6 +333,8 @@ namespace BTCPayServer.HostedServices
 
         public Task StopAsync(CancellationToken cancellationToken)
         {
+            if (_Cts == null)
+                return Task.CompletedTask;
             leases.Dispose();
             _Cts.Cancel();
             var waitingPendingInvoices = _WaitingInvoices ?? Task.CompletedTask;