Error in php log

Hi, I’m getting this notice in php log:

Notice: Undefined index: yzb-author-v1 in /var/www/html/wp-content/plugins/youzify/includes/public/core/class-youzify-author.php on line 84
Stack trace
1. {main}() /var/www/html/index.php:0
2. require() /var/www/html/index.php:17
3. require_once() /var/www/html/wp-blog-header.php:19
4. include() /var/www/html/wp-includes/template-loader.php:106
5. the_content() /var/www/html/wp-content/plugins/youzify/includes/public/templates/youzify-template.php:12
6. apply_filters() /var/www/html/wp-includes/post-template.php:253
7. WP_Hook->apply_filters() /var/www/html/wp-includes/plugin.php:212
8. bp_replace_the_content() /var/www/html/wp-includes/class-wp-hook.php:292
9. apply_filters() /var/www/html/wp-content/plugins/buddypress/bp-core/bp-core-theme-compatibility.php:761
10. WP_Hook->apply_filters() /var/www/html/wp-includes/plugin.php:212
11. BP_Activity_Theme_Compat->directory_content() /var/www/html/wp-includes/class-wp-hook.php:292
12. bp_buffer_template_part() /var/www/html/wp-content/plugins/buddypress/bp-activity/classes/class-bp-activity-theme-compat.php:118
13. bp_get_template_part() /var/www/html/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php:350
14. bp_locate_template() /var/www/html/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php:67
15. load_template() /var/www/html/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php:165
16. require() /var/www/html/wp-includes/template.php:732
17. do_action() /var/www/html/wp-content/plugins/youzify/includes/public/templates/activity/index.php:249
18. WP_Hook->do_action() /var/www/html/wp-includes/plugin.php:484
19. WP_Hook->apply_filters() /var/www/html/wp-includes/class-wp-hook.php:316
20. Youzify_Wall->get_wall_sidebar() /var/www/html/wp-includes/class-wp-hook.php:292
21. dynamic_sidebar() /var/www/html/wp-content/plugins/youzify/includes/public/core/class-youzify-wall.php:924
22. Youzify_Smart_Author_Widget->display_callback() /var/www/html/wp-includes/widgets.php:823
23. Youzify_Smart_Author_Widget->widget() /var/www/html/wp-includes/class-wp-widget.php:380
24. do_shortcode() /var/www/html/wp-content/plugins/youzify/includes/public/core/widgets/wordpress-widgets/class-youzify-smart-author-widget.php:191
25. preg_replace_callback() /var/www/html/wp-includes/shortcodes.php:218
26. do_shortcode_tag() /var/www/html/wp-includes/shortcodes.php:218
27. youzify_author_box_shortcode() /var/www/html/wp-includes/shortcodes.php:343
28. Youzify_Author->get_author_box() /var/www/html/wp-content/plugins/youzify/includes/public/core/functions/youzify-user-functions.php:455
29. Youzify_Author->get_elements() /var/www/html/wp-content/plugins/youzify/includes/public/core/class-youzify-author.php:38
30. Youzify_Author->get_box_structure() /var/www/html/wp-content/plugins/youzify/includes/public/core/class-youzify-author.php:96

Regards!