Updated AsyncSocketSession.cs

        public void ProcessReceive(SocketAsyncEventArgs e)
        {
            // check if the remote host closed the connection
            if (e.BytesTransferred <= 0)
            {
                Close(CloseReason.ClientClosing);
                return;
            }

            if (e.SocketError != SocketError.Success)
            {
                Close(CloseReason.SocketError);
                return;
            }

            int bytesTransferred = e.BytesTransferred;
            int offset = e.Offset;

            while (bytesTransferred > 0)
            {
                TCommandInfo commandInfo = default(TCommandInfo);
                int left = bytesTransferred;
                int offsetAcc = offset;

                while(left > 0)
                {
                    commandInfo = FindCommand(e.Buffer, offsetAcc, left, true, out left);
                    offsetAcc = offset + (bytesTransferred - left);
                }

                if (IsClosed)
                    return;

                if (commandInfo == null)
                    break;

                try
                {
                    ExecuteCommand(commandInfo);
                }
                catch (Exception exc)
                {
                    AppServer.Logger.LogError(this, exc);
                    HandleExceptionalError(exc);
                }

                if (left <= 0)
                    break;

                bytesTransferred = left;
                offset = e.Offset + e.BytesTransferred - left;
            }

            //read the next block of data sent from the client
            StartReceive(e);
        }