Realtime Issue - Subscribing to PostgreSQL failed {error, malformed_subscription_params}

Realtime was working this morning but stopped working around 2 hours ago. I'm seeing this error

Subscribing to PostgreSQL failed: {:error, :malformed_subscription_params}

Subscribing to PostgreSQL failed: {:error, :malformed_subscription_params}

Subscribing to PostgreSQL failed: {:error, :malformed_subscription_params}

Subscribing to PostgreSQL failed: {:error, :malformed_subscription_params} being spammed in my realtime logs.

Any ideas?