500 Error on user update

When I try to update a user with this plugin activated, it throws a 500 error. There are several entries in the error log, which I’ve copied below. I switched to a different plugin and got email working again, but wanted to share this with you to let you know that there are multiple instances of this plugin throwing a 500 error.

[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: PHP Fatal error: Uncaught exception ‘Google_Auth_Exception’ with message ‘Error refreshing the OAuth2 token, message: ‘{, referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: “error” : “invalid_grant”, referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: }” in /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php:363, referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: Stack trace:, referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: #0 /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php(278): Google_Auth_OAuth2->refreshTokenRequest(Array), referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: #1 /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Client.php(457): Google_Auth_OAuth2->refreshToken(‘1/eK7Siq-rCtG9Y…’), referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: #2 /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/class.phpmaileroauthgoogle.php(142): Google_Client->refreshToken(‘1/eK7Siq-rCtG9Y…’), referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: #3 /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/PHPMailer/class.smtp.php(471): GmailXOAuth2->getOauth64(), referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey
[Mon Feb 27 16:41:59 2017] [warn] [client 209.117.146.186] mod_fcgid: stderr: #4 /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/class.phpmaileroauth.php(153): SMTP->authenticate(”, ”, ‘XOAUTH2’, ”, ”, Object(GmailXOAuth2)) in /home/ngm-rs/public_html/phr/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php on line 363, referer: http://relevantseminars.org/phr/wp-login.php?action=lostpassword&error=invalidkey