Steps to reproduce:

1. Go to some collection (e.g.Planet Earth).

2. Press Edit button.

3. Go to Parts section (e.g. Planet Earth).

4. Press Add button.

5. JavaScript error appears.

There is error in process_error function on line 128 - response object doesn't contain errors (wanted: response.errors.title; and then: response.errors.errors).

Root cause is somewhere else, response object contains:

• errorThrown: SyntaxError

• • message: "Unexpected token <"
• • proto: Error

• sender: U.extend.init

• status: "parsererror"

• xhr: Object

Best regards, Milan ;)