Warning: Creating default object from empty value in…

When I go to Appearance > Customize the following appears:

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 38

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 39

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 40

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 41

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 42

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 44

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 45

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 46

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 47

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 48

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 50

Warning: Creating default object from empty value in /homepages/9/d575582266/htdocs/clickandbuilds/SonicFringe/wp-content/themes/rise-lite/includes/customizer.php on line 51

Can anyone advise what to do here? It’s stopping the menu working on mobile devices aswell!

Thanks,
Hannah