Error validating response: 'next_batch' is a required property

[h-oll]

Right after starting pantalaimon from CLI, I receive the following repeated error:
Error validating response: 'next_batch' is a required property.

I'm using pantalaimon 0.10.5 with the following config

[Default]
LogLevel=Debug
SSL=true

[home]
Homeserver=https://matrix.org
ListenAddress=127.0.0.1
ListenPort=8008

The debug log looks as

[2024-02-20 07:17:19.110481] INFO: pantalaimon: Restoring client for @XXX:matrix.org AAAAA
[2024-02-20 07:17:19.111317] INFO: pantalaimon: Indexing disabled.
[2024-02-20 07:17:19.184773] INFO: pantalaimon: Starting sync loop for @XXX:matrix.org
[2024-02-20 07:17:19.195063] INFO: pantalaimon: Restoring client for @XXX:matrix.org BBBBB
[2024-02-20 07:17:19.195369] INFO: pantalaimon: Indexing disabled.
[2024-02-20 07:17:19.271227] INFO: pantalaimon: Starting sync loop for @XXX:matrix.org
[2024-02-20 07:17:19.279062] INFO: pantalaimon: Restoring client for @XXX:matrix.org CCCCCC
[2024-02-20 07:17:19.279332] INFO: pantalaimon: Indexing disabled.
[2024-02-20 07:17:19.408621] INFO: pantalaimon: Starting sync loop for @XXX:matrix.org
======== Starting daemon for homeserver home on http://127.0.0.1:8008 ========
[2024-02-20 07:17:19.478876] DEBUG: pantalaimon: UI loop received message UpdateUsersMessage(server='home', user_id='@XXX:matrix.org', device_id='AAAAA')
(Press CTRL+C to quit)
[2024-02-20 07:17:19.579911] DEBUG: pantalaimon: UI loop received message UpdateDevicesMessage(pan_user='@XXX:matrix.org', ...
Error validating response: 'next_batch' is a required property
Error validating response: 'next_batch' is a required property
Error validating response: 'next_batch' is a required property
...

Any idea what might be going on?