diff --git a/includes/lib/general.php b/includes/lib/general.php
index cb5f257..e7e54db 100644
--- a/includes/lib/general.php
+++ b/includes/lib/general.php
@@ -30,7 +30,7 @@ function get_email_addresses_from_client_cert() {
 
 	// try SAN email addresses first
 	$envNameBase = "SSL_CLIENT_SAN_Email";
-	for ($i = 1; $i <= $maxAddresses; $i++) {
+	for ($i = 0; $i <= $maxAddresses; $i++) {
 		$envName = sprintf("%s_%d", $envNameBase, $i);
 		if (!array_key_exists($envName, $_SERVER)) {
 			break;