MailMunch JS Causing Errors

Hello, we have the Constant Contact by MailMunch plugin installed on our wordpress website, but ever since trying to update it is now causing JavaScript errors. The link address for site.js is https://a.mailmunch.co/app/v1/site.js

Which lead me to here.. Can anyone assist?

site.js:1 Uncaught TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them
at HTMLDocument.<anonymous> (site.js:1:17012)
at HTMLDocument.c (rocket-loader.min.js:1:9405)
at l (rocket-loader.min.js:1:1105)
at t.simulateStateAfterDeferScriptsActivation (rocket-loader.min.js:1:8630)
at Object.callback (rocket-loader.min.js:1:3075)
at t.run (rocket-loader.min.js:1:11340)
at rocket-loader.min.js:1:11156
at HTMLScriptElement.<anonymous> (rocket-loader.min.js:1:670)