diff --git a/websocket-sharp/Server/WebSocketServiceManager.cs b/websocket-sharp/Server/WebSocketServiceManager.cs
index a1ed50fa..5e4b4938 100644
--- a/websocket-sharp/Server/WebSocketServiceManager.cs
+++ b/websocket-sharp/Server/WebSocketServiceManager.cs
@@ -303,7 +303,8 @@ namespace WebSocketSharp.Server
           completed ();
       }
       catch (Exception ex) {
-        _logger.Fatal (ex.ToString ());
+        _logger.Error (ex.Message);
+        _logger.Debug (ex.ToString ());
       }
       finally {
         foreach (var cached in cache.Values)