diff --git a/websocket-sharp/Server/WebSocketSessionManager.cs b/websocket-sharp/Server/WebSocketSessionManager.cs
index 66256dcd..7c63db23 100644
--- a/websocket-sharp/Server/WebSocketSessionManager.cs
+++ b/websocket-sharp/Server/WebSocketSessionManager.cs
@@ -400,14 +400,20 @@ namespace WebSocketSharp.Server
       }
     }
 
-    internal Dictionary<string, bool> Broadping (byte[] frameAsBytes, TimeSpan timeout)
+    internal Dictionary<string, bool> Broadping (
+      byte[] frameAsBytes, TimeSpan timeout
+    )
     {
       var ret = new Dictionary<string, bool> ();
+
       foreach (var session in Sessions) {
-        if (_state != ServerState.Start)
+        if (_state != ServerState.Start) {
+          _log.Error ("The service is shutting down.");
           break;
+        }
 
-        ret.Add (session.ID, session.Context.WebSocket.Ping (frameAsBytes, timeout));
+        var res = session.Context.WebSocket.Ping (frameAsBytes, timeout);
+        ret.Add (session.ID, res);
       }
 
       return ret;