If your Ansible playbook needs to be stopped for a single node (host) of your inventory, be sure you do use "meta: end_host" and not "meta: end_play". The later stops the whole script, and can potentially creates a hard-to-debug situation, depending on your parallelism and the order on which nodes are checked during the playbook life.
The exact behavior is clear in the doc. One must only read it 🙂