Error on the users’ creation

Hi,
I connected my website to the Helloasso api. The test works. I received a json file with the subscribers of Helloasso.
When I try to launch the wp users’ creation, it works the first time (on the log file):

2022-09-03 23:57:46 :: <strong>Utilisateur créé pour l'adresse ******** :</strong> id n°2</br>

2022-09-03 23:57:46 :: Echec de la création du compte pour l'adresse **********</br>

But after it doesn’t work any more. When I put the debug mode on my website, I get this error:

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 811

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 812

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 813

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 814

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 815

Notice: Undefined index: class in /home/rvsegaq/www/wp-content/plugins/helloadherents/functions/settings-page.php on line 801

On those lines I have this function:

   foreach ( (array) $wp_settings_fields[ $page ][ $section['id'] ] as $field ) {

            if ($field['args']['class'] == 'options_group') {
                echo ('<div class="options_group">' . esc_html($field['title']));
                call_user_func( $field['callback'], $field['args'] );
                echo "<div id='content_options_group'>";
            } else {
                echo '<div style="width:100%;"><div class="ha_option_label">' . wp_kses_post($field['title']) . '</div><div class="ha_option_input">';
                call_user_func( $field['callback'], $field['args'] );
                echo '</div></div>';
            }

            if ($field['args']['class'] == 'test_ha_after') {echo "<br>"; helladh_test_api_ha();}
            if ($field['args']['class'] == 'test_google_after') {echo "<br>"; helladh_test_api_google(); echo "</div></div>";}            
            if ($field['args']['class'] == 'test_mailchimp_after') {echo "<br>"; helladh_test_api_mailchimp(); echo "</div></div>";}            
            if ($field['args']['class'] == 'test_wordpress_users_after') {echo "<br>"; helladh_test_wordpress_users(); echo "</div></div>";}            
            if ($field['args']['class'] == 'test_custom_function_after') {echo "<br>"; helladh_test_custom_function(); echo "</div></div>";}            

        }

I’m using your last plugin 1.2 and my wordpress is 6.0.2.
Did you see sometime this kind of error?
Thank you for your help.
Jérôme Lopez