AttributeError: 'NoneType' object has no attribute 'refresh_from_db_if_outdated'

[frafra]

Clean setup via docker-compose.yml, git revision 93207e1.

server_1  | WebSocket HANDSHAKING /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,128 INFO 140215240431360 django.channels.server runserver WebSocket HANDSHAKING /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,128 DEBUG 140215240431360 daphne.http_protocol http_protocol Upgraded connection ['172.177.0.1', 55946] to WebSocket
server_1  | 2021-05-08 16:43:16,129 DEBUG 140215240431360 daphne.ws_protocol ws_protocol WebSocket ['172.177.0.1', 55946] open and established
server_1  | WebSocket CONNECT /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,129 INFO 140215240431360 django.channels.server runserver WebSocket CONNECT /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,129 DEBUG 140215240431360 daphne.ws_protocol ws_protocol WebSocket ['172.177.0.1', 55946] accepted by application
server_1  | 2021-05-08 16:43:16,129 DEBUG 140215240431360 aioredis connection Parsed Redis URI ('redis', 6379)
server_1  | 2021-05-08 16:43:16,129 DEBUG 140215240431360 aioredis connection Creating tcp connection to ('redis', 6379)
server_1  | 2021-05-08 16:43:16,138 DEBUG 140214508975872 django.db.backends utils (0.002) SELECT "core_world"."version", "core_world"."id", "core_world"."title", "core_world"."config", "core_world"."roles", "core_world"."trait_grants", "core_world"."domain", "core_world"."locale", "core_world"."timezone", "core_world"."feature_flags" FROM "core_world" WHERE "core_world"."id" = 'sample' ORDER BY "core_world"."id" ASC LIMIT 1; args=('sample',)
server_1  | 2021-05-08 16:43:16,139 DEBUG 140215240431360 daphne.ws_protocol ws_protocol Sent WebSocket packet to client for ['172.177.0.1', 55946]
server_1  | 2021-05-08 16:43:16,206 DEBUG 140215240431360 daphne.ws_protocol ws_protocol WebSocket incoming frame on ['172.177.0.1', 55946]
server_1  | 2021-05-08 16:43:16,206 DEBUG 140215240431360 daphne.ws_protocol ws_protocol WebSocket closed for ['172.177.0.1', 55946]
server_1  | WebSocket DISCONNECT /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,206 INFO 140215240431360 django.channels.server runserver WebSocket DISCONNECT /ws/world/sample/ [172.177.0.1:55946]
server_1  | 2021-05-08 16:43:16,207 ERROR 140215240431360 venueless.live.consumers consumers Encountered exception, close socket.
server_1  | Traceback (most recent call last):
server_1  |   File "/app/venueless/live/consumers.py", line 188, in dispatch
server_1  |     return await super().dispatch(message)
server_1  |   File "/usr/local/lib/python3.8/site-packages/channels/consumer.py", line 73, in dispatch
server_1  |     await handler(message)
server_1  |   File "/usr/local/lib/python3.8/site-packages/channels/generic/websocket.py", line 196, in websocket_receive
server_1  |     await self.receive(text_data=message["text"])
server_1  |   File "/usr/local/lib/python3.8/site-packages/channels/generic/websocket.py", line 259, in receive
server_1  |     await self.receive_json(await self.decode_json(text_data), **kwargs)
server_1  |   File "/app/venueless/live/consumers.py", line 124, in receive_json
server_1  |     await self.world.refresh_from_db_if_outdated()
server_1  | AttributeError: 'NoneType' object has no attribute 'refresh_from_db_if_outdated'
server_1  | 2021-05-08 16:43:16,708 DEBUG 140215240431360 aioredis connection Cancelling waiter (<Future cancelled>, [None, None])
server_1  | 2021-05-08 16:43:16,709 DEBUG 140215240431360 aioredis util Waiter future is already done <Future cancelled>

I also tried to create a new world like this:

docker exec -it ${CONTAINER_ID} python manage.py create_world

Still the same error. I used localhost as domain, then I used the resulting URL, replacing HTTPS with HTTP and adding :8880 for the port.