Traceback (most recent call last):
  File "/tmp/.mount_electruNZcAE/usr/lib/python3.9/site-packages/electrum/gui/qt/my_treeview.py", line 308, in mouseDoubleClickEvent
    self.on_double_click(idx)
  File "/tmp/.mount_electruNZcAE/usr/lib/python3.9/site-packages/electrum/gui/qt/invoice_list.py", line 89, in on_double_click
    self.show_invoice(key)
  File "/tmp/.mount_electruNZcAE/usr/lib/python3.9/site-packages/electrum/gui/qt/invoice_list.py", line 148, in show_invoice
    self.main_window.show_onchain_invoice(invoice)
  File "/tmp/.mount_electruNZcAE/usr/lib/python3.9/site-packages/electrum/gui/qt/main_window.py", line 1412, in show_onchain_invoice
    outputs_str = '\n'.join(map(lambda x: x.address + ' : ' + self.format_amount(x.value)+ self.base_unit(), invoice.outputs))
  File "/tmp/.mount_electruNZcAE/usr/lib/python3.9/site-packages/electrum/gui/qt/main_window.py", line 1412, in <lambda>
    outputs_str = '\n'.join(map(lambda x: x.address + ' : ' + self.format_amount(x.value)+ self.base_unit(), invoice.outputs))
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'