Errors when making changes

The plugin gives the following errors that I mention below when you save changes

[03-Jun-2019 10:26:24 UTC] PHP Warning: Creating default object from empty value in /home/pbbsantceloni/public_html/wp-content/plugins/polldaddy/polldaddy.php on line 4522
[03-Jun-2019 10:26:24 UTC] PHP Stack trace:
[03-Jun-2019 10:26:24 UTC] PHP 1. {main}() /home/pbbsantceloni/public_html/wp-admin/options-general.php:0
[03-Jun-2019 10:26:24 UTC] PHP 2. require_once() /home/pbbsantceloni/public_html/wp-admin/options-general.php:10
[03-Jun-2019 10:26:24 UTC] PHP 3. do_action() /home/pbbsantceloni/public_html/wp-admin/admin.php:253
[03-Jun-2019 10:26:24 UTC] PHP 4. WP_Hook->do_action() /home/pbbsantceloni/public_html/wp-includes/plugin.php:465
[03-Jun-2019 10:26:24 UTC] PHP 5. WP_Hook->apply_filters() /home/pbbsantceloni/public_html/wp-includes/class-wp-hook.php:310
[03-Jun-2019 10:26:24 UTC] PHP 6. WPORG_Polldaddy->management_page() /home/pbbsantceloni/public_html/wp-includes/class-wp-hook.php:286
[03-Jun-2019 10:26:24 UTC] PHP 7. WPORG_Polldaddy->update_rating() /home/pbbsantceloni/public_html/wp-content/plugins/polldaddy/polldaddy.php:1414
[03-Jun-2019 10:28:29 UTC] PHP Warning: Creating default object from empty value in /home/pbbsantceloni/public_html/wp-content/plugins/polldaddy/polldaddy.php on line 4527
[03-Jun-2019 10:28:29 UTC] PHP Stack trace:
[03-Jun-2019 10:28:29 UTC] PHP 1. {main}() /home/pbbsantceloni/public_html/wp-admin/options-general.php:0
[03-Jun-2019 10:28:29 UTC] PHP 2. require_once() /home/pbbsantceloni/public_html/wp-admin/options-general.php:10
[03-Jun-2019 10:28:29 UTC] PHP 3. do_action() /home/pbbsantceloni/public_html/wp-admin/admin.php:253
[03-Jun-2019 10:28:29 UTC] PHP 4. WP_Hook->do_action() /home/pbbsantceloni/public_html/wp-includes/plugin.php:465
[03-Jun-2019 10:28:29 UTC] PHP 5. WP_Hook->apply_filters() /home/pbbsantceloni/public_html/wp-includes/class-wp-hook.php:310
[03-Jun-2019 10:28:29 UTC] PHP 6. WPORG_Polldaddy->management_page() /home/pbbsantceloni/public_html/wp-includes/class-wp-hook.php:286
[03-Jun-2019 10:28:29 UTC] PHP 7. WPORG_Polldaddy->update_rating() /home/pbbsantceloni/public_html/wp-content/plugins/polldaddy/polldaddy.php:1414