File "Electrum-3.1.1-py3.6.egg/electrum/util.py", line 792, in run_with_except_hook
  File "Electrum-3.1.1-py3.6.egg/electrum/network.py", line 984, in run
  File "Electrum-3.1.1-py3.6.egg/electrum/network.py", line 966, in wait_on_sockets
  File "Electrum-3.1.1-py3.6.egg/electrum/network.py", line 625, in process_responses
  File "Electrum-3.1.1-py3.6.egg/electrum/network.py", line 540, in process_response
  File "Electrum-3.1.1-py3.6.egg/electrum/network.py", line 1012, in on_notify_header
  File "Electrum-3.1.1-py3.6.egg/electrum/blockchain.py", line 241, in save_header
  File "Electrum-3.1.1-py3.6.egg/electrum/blockchain.py", line 233, in write