Hi there. In case it helps anyone else, I was having the same sidebar error:
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It seems your theme is generating a Fatal Error: Fatal error: Uncaught Error: Call to a member function get_option() on null in /wp-content/themes/rife-free/advance/sidebars.php:54
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Followed the instructions here
https://rifetheme.com/help/docs/customizing-the-theme/custom-sidebars/
to remove custom sidebars and it fixed the issue.
