File "site-packages\electrum-3.1.3-py3.5.egg\electrum\util.py", line 794, in run_with_except_hook
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\network.py", line 985, in run
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\network.py", line 967, in wait_on_sockets
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\network.py", line 626, in process_responses
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\network.py", line 541, in process_response
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\network.py", line 1013, in on_notify_header
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\blockchain.py", line 245, in save_header
  File "site-packages\electrum-3.1.3-py3.5.egg\electrum\blockchain.py", line 237, in write