Traceback (most recent call last):
  File "electrum/gui/qt/invoice_list.py", line 176, in <lambda>
  File "electrum/gui/qt/invoice_list.py", line 148, in show_invoice
  File "electrum/gui/qt/main_window.py", line 1412, in show_onchain_invoice
  File "electrum/gui/qt/main_window.py", line 1412, in <lambda>
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'