Why is Supabase giving me an error about returning 0 rows?

{
  code: 'PGRST116',
  details: 'The result contains 0 rows',
  hint: null,
  message: 'JSON object requested, multiple (or no) rows returned'
}

{
  code: 'PGRST116',
  details: 'The result contains 0 rows',
  hint: null,
  message: 'JSON object requested, multiple (or no) rows returned'
}