File "Electrum-3.1.3-py3.6.egg/electrum/util.py", line 794, in run_with_except_hook
  File "Electrum-3.1.3-py3.6.egg/electrum/network.py", line 985, in run
  File "Electrum-3.1.3-py3.6.egg/electrum/network.py", line 967, in wait_on_sockets
  File "Electrum-3.1.3-py3.6.egg/electrum/network.py", line 626, in process_responses
  File "Electrum-3.1.3-py3.6.egg/electrum/network.py", line 572, in process_response
  File "Electrum-3.1.3-py3.6.egg/electrum/network.py", line 832, in on_get_header
  File "Electrum-3.1.3-py3.6.egg/electrum/blockchain.py", line 245, in save_header
  File "Electrum-3.1.3-py3.6.egg/electrum/blockchain.py", line 237, in write