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Hi there,

In most instances, this error is a result of a theme or plugin conflict.

First, I would activate a default theme on your site (such as twenty seventeen) and see if the error persists.

If it does not, then I would look into any potential plugin conflicts.

I want to see you can try temporarily disabling all of your plugins (leaving Jetpack active), and if you no longer see the error, then we can most likely determine there is a plugin conflict.

To figure out which plugin is causing the issue, reactivate each plugin one at a time, and try to reproduce the error after each one that you activate. If you experience the problem after activating a particular plugin, you’ve likely found the culprit. I would try to find a replacement for that plugin, and hopefully, that will solve things for you.

Hopefully, this helps!