Traceback (most recent call last):
  File "electrum\gui\qt\invoice_list.py", line 166, in <lambda>
  File "electrum\gui\qt\main_window.py", line 1418, in show_onchain_invoice
  File "electrum\gui\qt\main_window.py", line 1418, in <lambda>
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'