It looks like you are using older version of WordPress. It’s not safe to user older version of WordPress core. So, please update the WordPress core to latest version 4.9.8 and it will work. This function was introduced in version 4.9.6 and looks like you have older version then this.
We will also add condition for this function in our next version update so that other user with old version of WordPress don’t get this issue.
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