Only first block loading

I have 2 blocks to be loaded by ajax.

The AJAX request looks like this:

mywebsite.com/ajaxblocks?blocks=block1/block2

The success function looks like this:

    success: function (data) {
      // Replaces the placeholder divs by the actual block contents returned by the AJAX call,
      // executes the extra JavaScript code and attach behaviours if the apply to the blocks.
      Drupal.freezeHeight();
      for (var id in data) {
          console.log("Worked");
        Drupal.ajaxblocksSetBlockContent(id, data[id]);
      }
      Drupal.unfreezeHeight();
    }

And the returned json looks like this:

{"block1":{"content":"my block content","ajaxblocks_settings":""},"block2":{"content":"my second block content","ajaxblocks_settings":""}}

Now only the first block (block1) is loaded. Why is this? The for-loop doesn't seem to work properly