invalid input syntax for type uuid: \"\"

[robksawyer]

I keep getting

{
    "code": "22P02",
    "details": null,
    "hint": null,
    "message": "invalid input syntax for type uuid: \"\""
}

when passing this

const p_user_id = userId as UUID;
console.log("p_user_id", p_user_id); // totally fine I even validated with uuidValidate
const { data, error } = await supabase.rpc("fetch_user_roles_permissions", {
  p_user_id,
});

However when I put quotes around it, I get the uuid in the response error like:

{
    "code": "22P02",
    "details": null,
    "hint": null,
    "message": "invalid input syntax for type uuid: \"\"7979b040-3f6e-42ec-8318-ee696638bbde\"\""
} 

What happens to the UUID? And why the error?