Fatal error: get_item_quantity

Hi, using the most recent plugin version.

Getting a fatal error as follows:

Fatal error: Call to undefined method WP_Error::get_item_quantity() in /home…/wp-content/plugins/social-media-tabs/inc/dcwp_widget.php on line 793.

Could you please let me know how to fix.
Thanks

https://ww.wp.xz.cn/plugins/social-media-tabs/