File "electrum/gui/qt/main_window.py", line 3074, in do_toggle
  File "electrum/plugin.py", line 152, in toggle
  File "electrum/plugin.py", line 135, in enable
  File "electrum/simple_config.py", line 160, in set_key
  File "electrum/simple_config.py", line 169, in _set_key_in_user_config
  File "electrum/simple_config.py", line 262, in save_user_config