There is a bug in King Composer plugin, that adds Youtube video URL in the shortcode parameter. It happens when one edits his page via KC Live Editor. Despite this code is invisible on the frontend, it may be indexed by Google.
We reported this bug to the KC developers and made a fix for all Crumina themes, where King Composer is used as a main page builder.
This issue won't appear for new customers, who purchased Crumina themes starting from March 2019.
For existing customers there is a fast solution, that is described below:
1. Go to Tools>Backup and make backup of your website, just in case of something.
2. Delete KC Pro plugin from the Plugins section and install it again from King Composer>General Settings section.
3. Install Better Search Replace plugin from the WP repository.
4. Go to Tools>Better Search Replace:
