I'm trying to fetch a collection from my server.
I'm using version 0.3.3 (not the master from github)
However I am running in this exception:

Uncaught TypeError: Cannot use 'in' operator to search for 'id' in {id=MyId, active=true}

    jQuery.jQuery.extend._Deferred.deferred.resolveWith (jquery.js:869)

    done (jquery.js:6591)

    jQuery.ajaxTransport.send.callback

This is the way I created the error:

var MyModel = Backbone.Model.extend();

var MyCollection = Backbone.Collection.extend({

    url: '/api/collection',

    model: MyModel

});

var coll = new MyCollection();

coll.fetch();

The elements in /api/collection are parsed in JSON.
I tried to return them in various formats

[Id1, Id2, ... ]

[{id: Id1, somethingElse: ...}, ...]

{id1: { id1s content}, id2: { ... }, ...}

However the error was always the same.
What is wrong with this code?

[Edit] It doesn't help to set an error via coll.fetch({error: errorFunc}); The Exception stays the same.

[Edit2] Well it seems everything works fine until collection.fetch() calls collection.refresh() with the response object. I have not overwritten any of these functions.

[Edit3] The error is in the collection.add() method and the reason is that my elements are a list of strings... My server sent them wrong.