AttributeError in Tryton Client 5.4.8

Sometimes when starting the Сlient we get the following message:

NoneType: None

AttributeError: 'NoneType' object has no attribute 'setsockopt'

There is the next message:

  File "C:\msys64\home\ced\tryton-5.4/tryton/gui/", line 288, in do_command_line
  File "C:\msys64\home\ced\tryton-5.4/tryton/gui/", line 285, in do_activate
  File "C:\msys64\home\ced\tryton-5.4/tryton/gui/", line 509, in get_preferences
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 1079, in RPCContextReload
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 1031, in run
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 1056, in process
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 1049, in return_
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 1042, in process
  File "C:\msys64\home\ced\tryton-5.4/tryton/common/", line 892, in process_exception

RPCException: 'NoneType' object has no attribute 'setsockopt'

What do these messages mean?

Does anyone else receive messages of this kind?