TcpIpSession.RaiseSessionClosedEvent throw System.NullReferenceException

[AdhamAwadhi]

Lately I got this error too much, not sure why still investagating

Type: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: JamaaTech.Smpp.Net.Lib
Stack Trace:

   at JamaaTech.Smpp.Net.Lib.Networking.TcpIpSession.RaiseSessionClosedEvent(SessionCloseReason reason, Exception ex)
   at JamaaTech.Smpp.Net.Lib.Networking.TcpIpSession.TerminateSession(SessionCloseReason reason, Exception exception)
   at JamaaTech.Smpp.Net.Lib.Networking.TcpIpSession.Receive(Byte[] buffer, Int32 start, Int32 length)
   at JamaaTech.Smpp.Net.Lib.StreamParser.WaitBytes(Int32 length)
   at JamaaTech.Smpp.Net.Lib.StreamParser.WaitPDU()
   at JamaaTech.Smpp.Net.Lib.StreamParser.RunNow()
   at JamaaTech.Smpp.Net.Lib.Util.RunningComponent.ThreadCallback()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()