Coreserver.exe crashed

Code:

2020/ 4/21   23:16:29   CClientSocket.Fetch: ip = 64.225.76.244, size = 1571870089

2020/ 4/21   23:16:29   CClientSocket.Fetch: ip = 64.225.76.244, size = 1953706093

2020/ 4/21   23:16:29   CClientSocket.Fetch: ip = 64.225.76.244, size = 1814967609

2020/ 4/21   23:16:30   CClientSocket.Fetch: ip = 64.225.76.244, size = 1946157061

2020/ 4/21   23:16:30   CClientSocket.Fetch: ip = 64.225.76.244, size = 1634563174

2020/ 4/21   23:16:30   CClientSocket.Fetch: ip = 64.225.76.244, size = 1946157320

2020/ 4/21   23:16:34   CClientSocket.Fetch: ip = 64.225.76.244, size = 1866611479

2020/ 4/21   23:17:43   CClientSocket.Fetch: ip = 167.172.48.101, size = 1915224069

2020/ 4/21   23:17:51   CClientSocket.Fetch: ip = 167.172.48.101, size = 1761607688

2020/ 4/21   23:17:52   CClientSocket.Fetch: ip = 167.172.48.101, size = 1785790469

2020/ 4/21   23:19:38   CORE : is not alive

2020/ 4/21   23:20:38   CORE : is not alive

2020/ 4/21   23:21:38   CORE : is not alive

And it crashes my coreserver.exe

additional logs.

21/04/2020 - 17:27:42

Code:

[CRASH] - C:\Users\Admin\Desktop\ServerFlyFF\Source\WorldServer\DPSrvr.cpp : CDPSrvr::UserMessageHandler (Ln. 704)

Code:

void CDPSrvr::UserMessageHandler( LPDPMSG_GENERIC lpMsg, DWORD dwMsgSize, DPID idFrom )
{
	TRY
	LPBYTE lpBuffer		= (LPBYTE)lpMsg + sizeof(DPID);
	u_long uBufSize		= dwMsgSize - sizeof(DPID);

	CAr ar( lpBuffer, uBufSize );
	GETTYPE( ar )

	void ( theClass::*pfn )( theParameters )	=	GetHandler( dw );

	if( pfn ) 
	{
		( this->*( pfn ) )( ar, idFrom, *(UNALIGNED LPDPID)lpMsg, lpBuffer, uBufSize );
	}
	CATCH
}

I got the exactly same problem with fatcode

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And I just need more information. on how to fix or to avoid this crash/error.

thanks a lot.

PS: It is not already on the public. it is a testing server only. so 1-3 players only connected.