I think this part is not unit tested
Also I would return FALSE in case of an error like done elsewhere
Since you've changed what this function can return, make sure as well that this new case is handled correctly where you call it

errors might happen making the http response not a correct JSON

I don't feel this is the correct way to check if an error occured with the request.

From what I see, the result is either FALSE or NULL on failure.

I think you better check the error_number returned

this key is not necessarily in the json object response

Ship It!

Ship It!