Traceback (most recent call last):
  File "electrum\gui\qt\util.py", line 1443, in on_qt_callback_signal
  File "electrum\gui\qt\network_dialog.py", line 76, in on_event_network_updated
  File "electrum\gui\qt\network_dialog.py", line 394, in update
  File "electrum\blockchain.py", line 250, in get_name
  File "electrum\blockchain.py", line 520, in get_hash
electrum.blockchain.MissingHeader: 880992