Strange warnings placed up my main menu.

Prerequisites • I have searched for similar feature requests in both open and closed discussions and cannot find an existing request. • I have verified that the feature is still missing from the latest stable versions of Elementor or Elementor Pro. What problem is your feature request going to solve? Please describe.. I'm trying to display a nice menu but I have a piece of text warning me that "Warning: Undefined array key "body_background_image_tablet" in /home/clients/8fa8619edb3ebeace5674854007dd274/sites/astrobot.studio/wp-content/plugins/elementor/includes/base/controls-stack.php on line 1487 Warning: Undefined array key "body_background_image_tablet" in /home/clients/8fa8619edb3ebeace5674854007dd274/sites/astrobot.studio/wp-content/plugins/elementor/includes/base/controls-stack.php on line 1487" How can I ensure this doesn't display and more importantly how can I solve what's causing this warning message? M…