Traceback (most recent call last):
  File "electrum\gui\qt\send_tab.py", line 523, in do_save_invoice
  File "electrum\gui\qt\send_tab.py", line 529, in save_pending_invoice
  File "electrum\wallet.py", line 1001, in save_invoice
  File "electrum\wallet.py", line 390, in save_db
  File "electrum\wallet_db.py", line 1524, in write
  File "electrum\util.py", line 445, in <lambda>
  File "electrum\util.py", line 441, in do_profile
  File "electrum\wallet_db.py", line 1534, in _write
  File "electrum\storage.py", line 87, in write
OSError: [Errno 9] Bad file descriptor