Realtime not processing messages

When subscribing to realtime events of database, the client's websocket receives the messages in the websocket feed, but doesn't call the specific message handler (lambda) in the subscribe. I'm using the self hosted 1.8.1. I'm using the javascript sdk

That's a because u r using the newer SDK and self hosted 1.8.1
Either use 1.9.0 or cloud or the old sdk