CLIENT_FETCH_ERROR: Unexpected token U in JSON at position 4

[alexerisov]

Question 💬

I configured nextauth, and it works nicely, but i get this error in logs multiple times:

{
    code: 'CLIENT_FETCH_ERROR',
    metadata: {
      error: FetchError: invalid json response body at https://<url>/api/auth/session reason: Unexpected token U in JSON 
              at position 4
              at /app/node_modules/next/node_modules/node-fetch/lib/index.js:272:32
              at processTicksAndRejections (internal/process/task_queues.js:93:5) {
                    type: 'invalid-json'
             },
      path: 'session'
    }
}

It logged by logger.error in nextauth options. It appears independently of session state and login\logout\register works correct.

Here's my session callback:

async session({ session, user, token }) {
      http.defaults.headers.common['Authorization'] = `Bearer ${token?.accessToken}`;
      try {
        const access = token.accessToken as string;

        const response = await http.get(`account/me`, {
          headers: {
            Authorization: `Bearer ${access}`
          }
        });

        const { full_name, email, avatar, language, user_type, pk } = response.data as UserResponseData;

        token.user_type = user_type;
        session.accessToken = access;
        session.user = { full_name, email, avatar, language, user_type, pk } as const;

        return session;
      } catch (error) {
        return null;
      }
    }

What could be the problem?

How to reproduce ☕️

I really don't know :D

Contributing 🙌🏽

No, I am afraid I cannot help regarding this