Traceback (most recent call last):
  File "electrum/gui/qt/confirm_tx_dialog.py", line 66, in timer_actions
  File "electrum/gui/qt/confirm_tx_dialog.py", line 89, in update_tx
  File "electrum/gui/qt/send_tab.py", line 227, in <lambda>
  File "electrum/wallet.py", line 1670, in make_unsigned_transaction
  File "electrum/wallet.py", line 218, 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 1273, in func_wrapper
  File "electrum/blockchain.py", line 474, in read_header
Exception: Expected to read a full header. This was only 0 bytes