File "electrum/gui/qt/transaction_dialog.py", line 213, in save
  File "electrum/gui/qt/main_window.py", line 3478, in save_transaction_into_wallet
  File "electrum/util.py", line 356, in <lambda>
  File "electrum/util.py", line 352, in do_profile
  File "electrum/storage.py", line 89, in write
  File "electrum/storage.py", line 100, in _write