File "/usr/lib/python3/dist-packages/electrum/gui/qt/main_window.py", line 119, in onPress
    self.func()
  File "/usr/lib/python3/dist-packages/electrum/gui/qt/__init__.py", line 229, in show_network_dialog
    self.network_updated_signal_obj)
  File "/usr/lib/python3/dist-packages/electrum/gui/qt/network_dialog.py", line 60, in __init__
    self.nlayout = NetworkChoiceLayout(network, config)
  File "/usr/lib/python3/dist-packages/electrum/gui/qt/network_dialog.py", line 309, in __init__
    self.update()
  File "/usr/lib/python3/dist-packages/electrum/gui/qt/network_dialog.py", line 351, in update
    use_tor=self.tor_cb.isChecked())
  File "/usr/lib/python3/dist-packages/electrum/gui/qt/network_dialog.py", line 142, in update
    name = b.get_name()
  File "/usr/lib/python3/dist-packages/electrum/blockchain.py", line 250, in get_name
    return self.get_hash(self.get_max_forkpoint()).lstrip('0')[0:10]
  File "/usr/lib/python3/dist-packages/electrum/blockchain.py", line 519, in get_hash
    raise MissingHeader(height)