Traceback (most recent call last):
  File "electrum\gui\qt\main_window.py", line 1673, in do_pay
  File "electrum\gui\qt\main_window.py", line 1687, in do_pay_invoice
  File "electrum\gui\qt\main_window.py", line 1738, in pay_onchain_dialog
  File "electrum\gui\qt\confirm_tx_dialog.py", line 185, in __init__
  File "electrum\gui\qt\util.py", line 344, in __init__
  File "electrum\gui\qt\confirm_tx_dialog.py", line 87, in update_tx
  File "electrum\gui\qt\main_window.py", line 1728, in <lambda>
  File "electrum\wallet.py", line 1424, in make_unsigned_transaction
  File "electrum\wallet.py", line 216, in get_locktime_for_new_transaction
  File "electrum\blockchain.py", line 486, in is_tip_stale
  File "electrum\blockchain.py", line 482, in header_at_tip
  File "electrum\util.py", line 1192, in func_wrapper
  File "electrum\blockchain.py", line 474, in read_header
Exception: Expected to read a full header. This was only 0 bytes