File "site-packages\electrum-3.1.1-py3.5.egg\electrum\util.py", line 792, in run_with_except_hook
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\network.py", line 984, in run
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\network.py", line 966, in wait_on_sockets
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\network.py", line 625, in process_responses
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\network.py", line 571, in process_response
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\network.py", line 831, in on_get_header
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\blockchain.py", line 241, in save_header
  File "site-packages\electrum-3.1.1-py3.5.egg\electrum\blockchain.py", line 233, in write