server.state ttl must be a number

[mindbits]

From the server.state API Reference:

ttl - time-to-live in milliseconds. Defaults to null (session time-life - cookies are deleted when the browser is closed).

so I would have expected to be able to set ttl explicitly to null (like in this example taken from the tutorial):

server.state('data', { ttl: null, .... });

but this throws the error

[1] ttl must be a number

(at Object.exports.assert (..../hoek/lib/index.js:425:11) at Object.exports.assert (..../lib/schema.js:15:10) at internals.Server.state (..../lib/server.js:481:16)