OSError: [Errno 28] No space left on device

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 2508, in closeEvent
  File "electrum\gui\qt\main_window.py", line 2523, in clean_up
  File "electrum\simple_config.py", line 111, in _set_config_value
  File "electrum\simple_config.py", line 301, in set_key
  File "electrum\simple_config.py", line 311, in _set_key_in_user_config
  File "electrum\simple_config.py", line 423, in save_user_config
OSError: [Errno 28] No space left on device