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 1685, in <lambda>
  File "electrum/wallet.py", line 1321, in make_unsigned_transaction