Metabox Plugin issue

Hi Metabox Team,

I've just seen an issue since you updated the latest version.

You can make a test by install the plugin "Classic Editor" to WordPress 5x, then create a new post. Open your browser console, you should see the problem

Uncaught TypeError: value.split is not a function ------ Slider.js line 19

I hope you could fix it soon, most of my products are using your plugin

Thank you