'Next.js - NextAuth throws error in Vercel

My next-auth works fine until a certain time. enter image description here

But then, its throwing (The red session text in the picture above)

GET https://yazankasa-eng.vercel.app/api/auth/session 504 [next-auth][error][client_fetch_error] 


https://next-auth.js.org/errors#client_fetch_error session SyntaxError: Unexpected token A in JSON at position 0

And it says "An unexpected error has occurred." on the screen. Is there any way I can deal with this? Thanks



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