Hello,
To begin, I want to extend my heartfelt apologies for the delayed reply, which is due to an unexpectedly high volume of inquiries.
We truly value your patience during this period.
If the chart has no issue on the back-end, but this error only happens only on front-end, that indicates it might be caused by a conflict on your Site.
wpDataTables is a WYSIWYG (What You See Is What You Get) concept-based plugin. This means that the table should look the same both in the back-end and in the front-end.
If your front-end table or chart looks and behaves differently than in the back-end, this usually implies that there is another plugin (or the current theme) that’s changing the behavior of our plugin.
Can you please change the theme and see if the issue is resolved?
If not, then please deactivate all other plugins except for our plugin, refresh the page where the issue is, and see if it is resolved (it should be).
If it is, then start activating other plugins one by one, and after each activation refresh the page to see if the issue occurred.
Once it does reoccur, you will have found the plugin causing the issue.
Let us know if you isolate a conflict with these steps?
We also notice in this error it mentiones a chart callback, so can you tell us did you perhaps try to add some custom script as a Chart Callback in our Main Plugin settings/Custom JS and CSS/Custom jS?
If that is the case, on some WordPress configurations, the script added that way might be blocked from hosting or another Plugin, so it’s best to add it directly to the WP Page as Custom HTML and wrap your custom Chart callback inside a HTML script tag, and try again.
Let us know if that helps.
Kind regards.
