Critical error showing on user frontend listing page if listing not published.

Hello team , When a new user register and creates a listing in medicalpro plugin and see its listing on frontend there is a critical error showing on frontend. Uncaught TypeError: Cannot access offset of type string on string in / wp-content/themes/listingpro/include/list-confirmation.php on line 106 $postmeta = getpostmeta($post->ID, 'lplistingprooptions', true); var_dump($postmeta); $planID = $postmeta['Plan_id'];