jquery: unexpected token C using ember

Here's my error:

SyntaxError: Unexpected token C
    at Object.parse (native)
    at jQuery.parseJSON (http://localhost:4200/assets/vendor.js:8219:14)
    at ajaxConvert (http://localhost:4200/assets/vendor.js:8501:19)
    at done (http://localhost:4200/assets/vendor.js:8962:15)
    at XMLHttpRequest.<anonymous> (http://localhost:4200/assets/vendor.js:9378:9)

I'm not sure where to go from here. I'm able to pull data from my backend json api with no problems, but when I try to save data, I just get that jquery error. I'm using the following call:

addObject(newObject) {
  newObject.save().then(() => this.transitionTo('page.index'));
}

I've read the jquery error has to do with the fact that it's trying to parse a json object into json, but since this is being done by ember, I'm not sure if I'm missing a step somewhere.

If anyone has any ideas of the right direction to look, I'd appreciate it.