Plugin Conflict

Dear support,
Super Socializer plugin is conflicting with WP Mail SMTP plugin during authentication.
See error_log:

#0 /home/xxxxx/public_html/wp-content/plugins/super-socializer/library/Google/Client.php(189): Google_Auth_OAuth2->setAccessToken(NULL)
#1 /home/xxxxx/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(121): Google_Client->setAccessToken(Array)
#2 /home/xxxxx/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(53): WPMailSMTP\Providers\Gmail\Auth->get_client()
#3 /home/xxxxx/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Mailer.php(79): WPMailSMTP\Providers\Gmail\Auth->__construct()
#4 /home/xxxxx/public_html/wp-content/plugins/wp-mail-smtp/src/MailCatcher.php(105): WPMailSMTP\Providers\Gmail\Mailer->send()
#5 /home/xxxxx/public_html/wp-includes/pluggable.php(488): WPMailSMTP\MailCatcher->send()
#6 /home/xxxxx/public_html/wp-includes/pluggable.php(1949): in /home/fctmkmal/public_html/wp-content/plugins/super-socializer/library/Google/Auth/OAuth2.php on line 180

Can you look into this?

Thanks