PHP Warning: Trying to access array offset on value of type bool

Running into tons of these errors. Could you please add a check when getting the option?

PHP Warning:  Trying to access array offset on value of type bool in /wp-content/plugins/postman-smtp/Postman/PostmanOAuthToken.php on line 45
PHP Warning:  Trying to access array offset on value of type bool in /wp-content/plugins/postman-smtp/Postman/PostmanOAuthToken.php on line 46
PHP Warning:  Trying to access array offset on value of type bool in /wp-content/plugins/postman-smtp/Postman/PostmanOAuthToken.php on line 47
PHP Warning:  Trying to access array offset on value of type bool in /wp-content/plugins/postman-smtp/Postman/PostmanOAuthToken.php on line 48
PHP Warning:  Undefined array key "SERVER_NAME" in /wp-content/plugins/postman-smtp/Postman/Postman-Mail/PostmanDefaultModuleTransport.php on line 37

This is in the load() function, and $a is returning false:

$a = get_option ( PostmanOAuthToken::OPTIONS_NAME );