This error occurs on wp admin and causes disabling of theme customiser.
To solve, open unminified version of js file — input.js inside ACF plugin’s folder, find line 987 and add the code, so the result looked like this:
$(document).ready(function(){
/* added this condition, since acf.o was null at certain points for some reason when in the admin backend */
if (acf.o == null) {
return;
}
// update post_id
acf.screen.post_id = acf.o.post_id;
acf.screen.nonce = acf.o.nonce;
Then minify the js code via minifier (for example this one: https://javascript-minifier.com/, copy and replace the content of input.min.js, upload to server plugin’s folder and voila.
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