File "electrum\gui\qt\main_window.py", line 3191, in closeEvent
  File "electrum\gui\qt\main_window.py", line 3218, in clean_up
  File "electrum\gui\qt\__init__.py", line 385, in close_window
  File "electrum\daemon.py", line 527, in stop_wallet
  File "concurrent\futures\_base.py", line 439, in result
  File "concurrent\futures\_base.py", line 388, in __get_result
  File "electrum\daemon.py", line 535, in _stop_wallet
  File "electrum\wallet.py", line 381, in stop
  File "electrum\wallet.py", line 315, in save_db
  File "electrum\wallet_db.py", line 1354, in write
  File "electrum\util.py", line 412, in <lambda>
  File "electrum\util.py", line 408, in do_profile
  File "electrum\wallet_db.py", line 1364, in _write
  File "electrum\storage.py", line 85, in write