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getToken throws an error

See original GitHub issue

Describe the bug After updating to 3.15.5 the following code throws an error

export default async function TruAPIHandler(
  req: NextApiRequest,
  res: NextApiResponse,
) {
  // getToken will throw
  const token = await getToken({
    req,
    secret: process.env.NEXTAUTH_SECRET,
    encryption: true,
    signingKey: process.env.NEXTAUTH_SIGNIN_KEY,
    encryptionKey: process.env.NEXTAUTH_ENCRYPTION_KEY,
  })

Steps to reproduce I’m using an encrypted JWT in my configuration

  secret: process.env.NEXTAUTH_SECRET,
  session: {
    jwt: true,
  },
  jwt: {
    encryption: true,
    secret: process.env.NEXTAUTH_SECRET,
    signingKey: process.env.NEXTAUTH_SIGNIN_KEY,
    encryptionKey: process.env.NEXTAUTH_ENCRYPTION_KEY,
  },

Simple repo to reproduce https://github.com/mtt87/next-auth-bug

Expected behavior It should not throw an error and return the token as it happens correctly on 3.14.8

Screenshots or error logs

TypeError: Object(...) is not a function
    at TruAPIHandler (webpack-internal:///./pages/api/tru/[...params].ts:9:85)
    at apiResolver (/Users/mattia/node_modules/next/dist/next-server/server/api-utils.js:8:7)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async DevServer.handleApiRequest (/Users/mattia/node_modules/next/dist/next-server/server/next-server.js:67:462)
    at async Object.fn (/Users/mattia/node_modules/next/dist/next-server/server/next-server.js:59:492)
    at async Router.execute (/Users/mattia/node_modules/next/dist/next-server/server/router.js:25:67)
    at async DevServer.run (/Users/mattia/node_modules/next/dist/next-server/server/next-server.js:69:1042)
    at async DevServer.handleRequest (/Users/mattia/node_modules/next/dist/next-server/server/next-server.js:34:504)