File "electrum\util.py", line 882, in run_with_except_hook
  File "electrum\network.py", line 1085, in run
  File "electrum\network.py", line 1067, in wait_on_sockets
  File "electrum\network.py", line 719, in process_responses
  File "electrum\network.py", line 624, in process_response
  File "electrum\network.py", line 1122, in on_notify_header
  File "electrum\blockchain.py", line 126, in func_wrapper
  File "electrum\blockchain.py", line 282, in save_header
  File "electrum\blockchain.py", line 272, in write