When attempting to submit a MailChimp form on my site, the form becomes unclickable, no message is shown, and the console gives this error:
Uncaught TypeError: Cannot read property ‘error’ of null
at Object.success (main.js:88)
at i (jquery.js?ver=1.12.4:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4:2)
at y (jquery.js?ver=1.12.4:4)
at XMLHttpRequest.c (jquery.js?ver=1.12.4:4)
How do I fix this?