File "/app/lib/python3.8/site-packages/electrum/gui/qt/invoice_list.py", line 165, in <lambda>
    menu.addAction(_("Pay") + "...", lambda: self.parent.do_pay_invoice(invoice))
  File "/app/lib/python3.8/site-packages/electrum/gui/qt/main_window.py", line 1646, in do_pay_invoice
    self.pay_onchain_dialog(self.get_coins(), invoice.outputs)
  File "/app/lib/python3.8/site-packages/electrum/gui/qt/main_window.py", line 1715, in pay_onchain_dialog
    self.save_pending_invoice()
  File "/app/lib/python3.8/site-packages/electrum/gui/qt/main_window.py", line 1624, in save_pending_invoice
    self.wallet.save_invoice(self.pending_invoice)
  File "/app/lib/python3.8/site-packages/electrum/wallet.py", line 790, in save_invoice
    self.save_db()
  File "/app/lib/python3.8/site-packages/electrum/wallet.py", line 315, in save_db
    self.db.write(self.storage)
  File "/app/lib/python3.8/site-packages/electrum/wallet_db.py", line 1344, in write
    self._write(storage)
  File "/app/lib/python3.8/site-packages/electrum/util.py", line 412, in <lambda>
    return lambda *args, **kw_args: do_profile(args, kw_args)
  File "/app/lib/python3.8/site-packages/electrum/util.py", line 408, in do_profile
    o = func(*args, **kw_args)
  File "/app/lib/python3.8/site-packages/electrum/wallet_db.py", line 1354, in _write
    storage.write(json_str)
  File "/app/lib/python3.8/site-packages/electrum/storage.py", line 98, in write
    os.chmod(self.path, mode)