Javascript Console:
VM2904:1 POST https://***OURDOMAIN***.co.uk/wp-admin/admin-ajax.php?flag=ns_cloner_process_init 500
(anonymous) @ VM2904:1
send @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
ajax @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
ajax @ ns-cloner.js?ver=4.0.9:388
submit @ ns-cloner.js?ver=4.0.9:485
(anonymous) @ ns-cloner.js?ver=4.0.9:347
dispatch @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:3
r.handle @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:3
ns-cloner.js?ver=4.0.9:396
error @ ns-cloner.js?ver=4.0.9:396
i @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:2
fireWith @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:2
x @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
c @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
XMLHttpRequest.send (async)
(anonymous) @ VM2904:1
send @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
ajax @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:4
ajax @ ns-cloner.js?ver=4.0.9:388
submit @ ns-cloner.js?ver=4.0.9:485
(anonymous) @ ns-cloner.js?ver=4.0.9:347
dispatch @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:3
r.handle @ load-scripts.php?c=1&load[chunk_0]=jquery-core,utils&ver=5.5.1:3