warning undefined array

Hi,

The warning shared is pointing to js_composer directory. This is a directory of the WPBakery Page Builder plugin: https://wpbakery.com/
The WPBakery Page Builder relies on shortcodes to render it’s content while the Visual Composer Website Builder uses react based rendering. Both are independent plugins. You can check the detailed differences between them here: https://help.visualcomposer.com/docs/getting-started/visual-composer-vs-wpbakery/
Since the issue is arising from WPBakery Page Builder plugin, kindly contact it’s support: https://support.wpbakery.com/