Undefined array key “ssba_bar_buttons”

My error logs show below errors that have filled up the log size. Can you please advise? (WordPress 6.7.2 on PHP 8.2 with Simple Share Buttons Adder plugin version 8.5.2.)

2025/03/07 00:03:15 [error] 471659#471659: *135253 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined array key "ssba_bar_buttons" in /.../wp-content/plugins/simple-share-buttons-adder/php/class-buttons.php on line 602;

Current code on line 602: $network_color = 'Y' === $arr_settings['ssba_new_buttons'] || 'Y' === $arr_settings['ssba_bar_buttons'] ? self::get_button_color( $button_name ) : '';