sendLink href has added undefined

[Uncle798]

The href being generated by the sendMagicLink function seems be adding 'undefined' before the question mark and token=.
Here is my strategy:

const magicLogin = new MagicLoginStrategy({
  secret: process.env.MAGIC_LINK_SECRET,
  callbackURL: '/auth/magiclogin/callback',
  sendMagicLink: async (destination, href) => {
    try {
      console.log(href)
      await sendEmail(destination.email, destination.givenName, href);
    } catch (error) {
      console.error(error);
    }
  },
  verify: async (payload, callback) => {
    try {
      const dbUser = await prisma.user.upsert({
        where: {
          email: payload.destination,
        },
        update: {
          updatedAt: new Date(Date.now()),
        },
        create: {
          data: {
            email: payload.destination,
            emailVerified: new Date(Date.now()),
          },
        },
        include: {
          employee: {
            select: {
              userId: true,
              isAdmin: true,
            },
          },
        },
      });
      return callback(null, dbUser);
    } catch (error) {
      return callback(error);
    }
  },
});
passport.use(magicLogin);

router.post('/sendlink', magicLogin.send);
router.get('/magiclogin/callback', passport.authenticate('magiclogin'));

The href that is passed to my sendMail function looks like this:

undefined?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJkZXN0aW5hdGlvbiI6eyJlbWFpbCI6ImVyaWMuYnJhbnNvbkBnbWFpbC5jb20iLCJnaXZlbk5hbWUiOiJFcmljIn0sImNvZGUiOiI5OTE4MSIsImlhdCI6MTY3NjA0MzMwOCwiZXhwIjoxNjc2MDQ2OTA4fQ.9vAUmm1pAPIX-tJq8qE3HK-mRY-ZMH7qeJByIqO2RWo

I can remove the undefined but I don't know how it got there in the first place.

This is all in windows 10 in Node 18.12.1