skygear return 500 when changing email has been taken

[klam00]

skygear return 500 when changing email has been taken

• Skygear Server Date/Version:
• Application Platform:
• Is this a regression?
• Attached logs, screenshots

Expected Results

Actual Results

Steps to reproduce

if var email has been taken in skygear

skygear.saveUser({
    id: skygear.currentUser.id,
    email: email
  }).then(() => {
  }, (err) => {
      //err == {name: "UnexpectedError", code: 10000, message: "pq: duplicate key value violates unique constraint "_user_email_key""}
})