File "site-packages\electrum-3.2.2-py3.5.egg\electrum_gui\qt\main_window.py", line 3023, in closeEvent
  File "site-packages\electrum-3.2.2-py3.5.egg\electrum_gui\qt\main_window.py", line 3036, in clean_up
  File "site-packages\electrum-3.2.2-py3.5.egg\electrum\simple_config.py", line 141, in set_key
  File "site-packages\electrum-3.2.2-py3.5.egg\electrum\simple_config.py", line 150, in _set_key_in_user_config
  File "site-packages\electrum-3.2.2-py3.5.egg\electrum\simple_config.py", line 216, in save_user_config