Fixed exception thrown when terminate the program with Ctrl+C. (#130)

CAP.sln

@@ -17,6 +17,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		CHANGELOG.md = CHANGELOG.md
 		CODE_OF_CONDUCT.md = CODE_OF_CONDUCT.md
 		ConfigureMSDTC.ps1 = ConfigureMSDTC.ps1
+		.github\ISSUE_TEMPLATE = .github\ISSUE_TEMPLATE
 		LICENSE.txt = LICENSE.txt
 		README.md = README.md
 		README.zh-cn.md = README.zh-cn.md

src/DotNetCore.CAP/Processor/IProcessingServer.Cap.cs

@@ -57,13 +57,14 @@ namespace DotNetCore.CAP.Processor
                 return;
             }
 
+            try
+            {
                 _disposed = true;
 
                 _logger.ServerShuttingDown();
                 _cts.Cancel();
-            try
-            {
-                _compositeTask.Wait((int) TimeSpan.FromSeconds(10).TotalMilliseconds);
+
+                _compositeTask?.Wait((int)TimeSpan.FromSeconds(10).TotalMilliseconds);
             }
             catch (AggregateException ex)
             {
@@ -73,6 +74,10 @@ namespace DotNetCore.CAP.Processor
                     _logger.ExpectedOperationCanceledException(innerEx);
                 }
             }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "An exception was occured when disposing...");
+            }
         }
 
         private IProcessor InfiniteRetry(IProcessor inner)