File "electrum\gui\qt\main_window.py", line 2899, in closeEvent
  File "electrum\gui\qt\main_window.py", line 2916, in clean_up
  File "electrum\gui\qt\__init__.py", line 338, in close_window
  File "electrum\daemon.py", line 474, in stop_wallet
  File "electrum\wallet.py", line 327, in stop
  File "electrum\wallet.py", line 265, in save_db
  File "electrum\wallet_db.py", line 1129, in write
  File "electrum\wallet_db.py", line 1137, in _write
  File "electrum\util.py", line 441, in <lambda>
  File "electrum\util.py", line 437, in do_profile
  File "electrum\storage.py", line 103, in write