Traceback (most recent call last):
  File "/tmp/.mount_electr8dsv0u/usr/lib/python3.9/site-packages/electrum/network.py", line 896, in broadcast_transaction
    out = await self.interface.session.send_request('blockchain.transaction.broadcast', [tx.serialize()], timeout=timeout)
AttributeError: 'NoneType' object has no attribute 'session'