Connection aborted error not handled

[1Blademaster]

INFO:fgcs:Cleaning up resources for drone at <app.drone.Drone object at 0x0000026C1F2D15D0>
ERROR:fgcs:[WinError 10053] An established connection was aborted by the software in your host machine
Traceback (most recent call last):
  File "E:\projects\FGCS\radio\app\drone.py", line 471, in checkForMessages
    msg = self.master.recv_msg()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "E:\projects\FGCS\radio\venv\Lib\site-packages\pymavlink\mavutil.py", line 475, in recv_msg
    s = self.recv(n)
        ^^^^^^^^^^^^
  File "E:\projects\FGCS\radio\venv\Lib\site-packages\pymavlink\mavutil.py", line 1277, in recv
    data = self.port.recv(n)
           ^^^^^^^^^^^^^^^^^
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

Error occurs when SITL closes and fgcs is still running/connected. Only occasionally though, not always.