supabase calling supabase.auth.user().id crashes server error 500

userDetails() {
  return supabase
  .from('muni_users')
  .select('*')
  .eq('user_id', supabase.auth.user().id);
},

export async function load() {
  const { data: muni_user, error: bleh } = await db.users.userDetails();
  console.log(muni_user)
};

Cannot read properties of null (reading 'id')
TypeError: Cannot read properties of null (reading 'id')