chia.wallet.wallet_node: Loop exception in sync 'NoneType' object has no attribute

[keliew]

Am getting a bunch of errors as follows,

2021-07-28T07:06:42.996 wallet chia.wallet.wallet_node    : INFO     Loop start in sync job
2021-07-28T07:06:42.997 wallet chia.wallet.wallet_node    : INFO     Have collected 2713 potential peaks
2021-07-28T07:06:43.005 wallet chia.wallet.wallet_node    : ERROR    Loop exception in sync 'NoneType' object has no attribute '__annotations__'. Traceback (most recent call last):
  File "/home/chia/chia/chia/wallet/wallet_node.py", line 581, in sync_job
    await self._sync()
  File "/home/chia/chia/chia/wallet/wallet_node.py", line 634, in _sync
    fork_height = await check_fork_next_block(self.wallet_state_manager.blockchain, fork_height, peers)
  File "/home/chia/chia/chia/full_node/full_node.py", line 2043, in check_fork_next_block
    full_node_protocol.RequestBlock(uint32(our_peak_height + 1), True)
  File "/home/chia/chia/chia/server/ws_connection.py", line 282, in invoke
    req_annotations = ret_attr.__annotations__
AttributeError: 'NoneType' object has no attribute '__annotations__'
2021-07-28T07:06:43.006 wallet chia.wallet.wallet_node    : INFO     Loop end in sync job

Full node is synced, and wallet is still syncing after 2 days. There are two wallet keys on this node, wherein the 1st wallet key is fully synced, and the 2nd wallet key is still syncing...

Don't think I have seen such an error before, when it's only 1 wallet key.

Is this the cause of the slow sync for wallets?