File "electrum\gui\qt\confirm_tx_dialog.py", line 66, in timer_actions
  File "electrum\gui\qt\confirm_tx_dialog.py", line 86, in update_tx
  File "electrum\gui\qt\main_window.py", line 1681, in <lambda>
  File "electrum\wallet.py", line 1321, in make_unsigned_transaction