This issue is caused due to Facebook Pixel calling an object which conflicts with a Luminate object name. This error started occurring on 9/18/2017. A potential solution is to apply this snippet to the CMS wrapper:
function FormData(formName) {
//Override a conflict between
//CMS form.js file and Facebook's fbevents.js file.
//Both use an object named FormData
console.log("FormData() called.");

Another possibility is to move all Facebook Pixel code above the CMS code.

Disclaimer: Blackbaud provides programming examples for illustration only without warranty either expressed or implied including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes you are familiar with HTML/CSS/JavaScript and the tools used to create and modify this code. Blackbaud Customer Support may help explain where the code should live in the product, but we will not modify or assist you with modifying or troubleshooting these examples.