TypeError: Cannot read property 'expires' of undefined when using the crypto option

This error only appears when crypto.secret is set.

I have done some debugging and the issue seems to be that the session object is over stringified while the crypto option is used. Therefore, the session json is not converted to an object while the createSession function treats the session parameter as an object.

At MongoStore.js line 197, the session is still a json string when it is passed to callback.:

const s = session && this.transformFunctions.unserialize(session.session);
if (this.options.touchAfter > 0 && (session === null || session === void 0 ? void 0 : session.lastModified)) {
    s.lastModified = session.lastModified;
}
this.emit('get', sid);
callback(null, s);

Trace:

TypeError: Cannot read property 'expires' of undefined
    at MongoStore.Store.createSession (...\node_modules\express-session\session\store.js:87:29)
    at inflate (...\node_modules\express-session\index.js:368:13)
    at ...\node_modules\express-session\index.js:495:11
    at ...\node_modules\connect-mongo\build\main\lib\MongoStore.js:202:17

[mingchuno]

fixed in 4.2.2

[jas-]

As an FYI, a new release for kruptein should address this with v3.0.0. I have been testing with the example project and should have a PR soon