Traceback (most recent call last):
  File "electrum/gui/qt/main_window.py", line 132, in onPress
  File "electrum/gui/qt/__init__.py", line 276, in show_network_dialog
  File "electrum/gui/qt/network_dialog.py", line 61, in __init__
  File "electrum/gui/qt/network_dialog.py", line 320, in __init__
  File "electrum/gui/qt/network_dialog.py", line 368, in update
  File "electrum/gui/qt/network_dialog.py", line 153, in update
  File "electrum/blockchain.py", line 244, in get_name
  File "electrum/blockchain.py", line 513, in get_hash
electrum.blockchain.MissingHeader: 703584