Error on vars auto_insert_where / where, etc

Hi everyone,
I was using YARS for a good amount of months without any problem. In the last days my client noticed that his website break apparently from nothing. I activated the debug mode and had to face to some errors of the plugin. These are the errors I found:

Notice: Undefined index: auto_insert_where in /var/www/giacovelli/web/viaggimalta.it/wp-content/plugins/yet-another-stars-rating/yet-another-stars-rating.php on line 101

Notice: Undefined index: auto_insert_size in /var/www/giacovelli/web/viaggimalta.it/wp-content/plugins/yet-another-stars-rating/yet-another-stars-rating.php on line 102

Notice: Undefined index: auto_insert_exclude_pages in /var/www/giacovelli/web/viaggimalta.it/wp-content/plugins/yet-another-stars-rating/yet-another-stars-rating.php on line 103

Notice: Undefined index: auto_insert_custom_post_only in /var/www/giacovelli/web/viaggimalta.it/wp-content/plugins/yet-another-stars-rating/yet-another-stars-rating.php on line 104

Notice: Undefined index: snippet in /var/www/giacovelli/web/viaggimalta.it/wp-content/plugins/yet-another-stars-rating/yet-another-stars-rating.php on line 128

I opened the interested file, and this is where it breaks:

if ( YASR_AUTO_INSERT_ENABLED == 1 ) {
        define( "YASR_AUTO_INSERT_WHAT", $yasr_stored_options['auto_insert_what'] );
        define( "YASR_AUTO_INSERT_WHERE", $yasr_stored_options['auto_insert_where'] );
        define( "YASR_AUTO_INSERT_SIZE", $yasr_stored_options['auto_insert_size'] );
        define( "YASR_AUTO_INSERT_EXCLUDE_PAGES", $yasr_stored_options['auto_insert_exclude_pages'] );
        define( "YASR_AUTO_INSERT_CUSTOM_POST_ONLY", $yasr_stored_options['auto_insert_custom_post_only'] );
    } 

So, I opened mysql and looked for the stored data in wp_options. I think this is the interested line:

option_name :
yasr_general_options

option_value :
a:16:{s:16:”auto_insert_what”;s:14:”overall_rating”;s:19:”text_before_overall”;s:0:””;s:26:”text_before_visitor_rating”;s:0:””;s:25:”text_after_visitor_rating”;s:0:””;s:24:”custom_text_must_sign_in”;s:0:””;s:22:”custom_text_user_voted”;s:0:””;s:12:”allowed_user”;s:15:”allow_anonymous”;s:16:”snippet_itemtype”;s:5:”Other”;s:29:”blogposting_organization_name”;s:14:”ViaggiMALTA.it”;s:29:”blogposting_organization_logo”;s:53:”https://viaggimalta.it/wp-content/uploads/favicon.png”;s:19:”auto_insert_enabled”;i:1;s:20:”show_overall_in_loop”;s:7:”enabled”;s:26:”show_visitor_votes_in_loop”;s:7:”enabled”;s:17:”text_before_stars”;i:1;s:14:”visitors_stats”;s:3:”yes”;s:9:”enable_ip”;s:3:”yes”;}

Here you can see that all the mentioned var are not present, except for “auto_insert_what” that is present but throws the error anyway.

Please give me an hand, the customer is already complying about the loss of the stars and all the consequences involving google results.

Plugin version: 1.9.4
WP version: 4.9 – About this I read that I should update WP, but my client doesn’t want to switch to Gutenberg so for now I have to keep it stucked at that version.

The page I need help with: [log in to see the link]