[Modify] Polish it

This commit is contained in:
sta 2021-10-22 19:36:00 +09:00
parent 7d234b5ab8
commit 558dee9338

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@ -504,6 +504,7 @@ namespace WebSocketSharp.Server
{
if (_websocket == null) {
var msg = "The session has not started yet.";
throw new InvalidOperationException (msg);
}