Updating failed. The response is not a valid JSON response.

I receive this error whenever I use the [catchthemes_social_icons] shortcode within the BODY of my page. When I remove the shortcode, I do not have the error. The Page actually updates but with the error. Updating failed. The response is not a valid JSON response. The page is on a development site. Look under Social Media: http://box2004.temp.domains/~ncwaudub/communication/