File "electrum/gui/qt/__init__.py", line 215, in wrapper
  File "electrum/gui/qt/__init__.py", line 239, in start_new_window
  File "electrum/gui/qt/__init__.py", line 284, in _start_wizard_to_select_or_create_wallet
  File "electrum/gui/qt/installwizard.py", line 331, in run_upgrades
  File "electrum/base_wizard.py", line 151, in upgrade_storage
  File "electrum/gui/qt/installwizard.py", line 503, in waiting_dialog
  File "electrum/base_wizard.py", line 144, in on_finished
  File "electrum/base_wizard.py", line 148, in do_upgrade
  File "electrum/storage.py", line 230, in upgrade
  File "electrum/util.py", line 356, in <lambda>
  File "electrum/util.py", line 352, in do_profile
  File "electrum/storage.py", line 88, in write
  File "electrum/storage.py", line 99, in _write