I was trawling through the logs in my Home Assistant instance recently and this was coming up a lot:
2026-01-21 23:52:38.204 WARNING (MainThread) [supervisor.addons.options] Option 'require_ssl' does not exist in the schema for Node-RED (a0d7b954_nodered)
Took me a little bit to find it, but going to Settings -> Addons -> Node Red -> Configuration tab.. then clicking the … and opening the YAML config, I found an extra line in the config and removed it, fixing the issue. It would have been something from an old version that wasn’t removed automagically.
Handy link: https://example.com/hassio/addon/a0d7b954_nodered/config - note the a0d7b954_nodered matches the addon :)