php 8.1 fatal error on AMP

Fatal error: Uncaught Error: method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given
in /../wp-content/plugins/mashshare-networks/includes/template-functions.php on line 79

Call stack:

1. method_exists()
   wp-content/plugins/mashshare-networks/includes/template-functions.php:79
2. mashnet_get_pinterest_image()
   wp-content/plugins/mashshare-networks/includes/template-functions.php:37
3. mashnet_modify_arrNetworks()
   wp-includes/class-wp-hook.php:308
4. WP_Hook::apply_filters()
   wp-includes/plugin.php:205
5. apply_filters()
   wp-content/plugins/mashsharer/includes/template-functions.php:455
6. arrNetworks()
   wp-content/plugins/mashsharer/includes/template-functions.php:566
7. mashsb_getNetworks()
   wp-content/plugins/mashsharer/includes/template-functions.php:726
8. mashshareShow()
   wp-content/plugins/mashsharer/includes/template-functions.php:1055
9. mashshare_filter_content()
   wp-includes/class-wp-hook.php:308
10. WP_Hook::apply_filters()
    wp-includes/plugin.php:205
11. apply_filters()
    wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-content.php:54
12. AMPforWP\AMPVendor\AMP_Content::transform()
    wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-content.php:26
13. AMPforWP\AMPVendor\AMP_Content::__construct()
    wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-post-template.php:327
14. AMPforWP\AMPVendor\AMP_Post_Template::build_post_content()
    wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-post-template.php:121
15. AMPforWP\AMPVendor\AMP_Post_Template::__construct()
    wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/amp.php:94
16. AMPforWP\AMPVendor\amp_render()
    wp-includes/class-wp-hook.php:308
17. WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:332
18. WP_Hook::do_action()
    wp-includes/plugin.php:517
19. do_action()
    wp-includes/template-loader.php:13
20. require_once()
    wp-blog-header.php:19
21. require()
    index.php:17