diff --git a/api/auth/Register.php b/api/auth/Register.php
index bda851153fe5abff08087eee07dfe226825e9adb..61e926e70b7f28edcbdfce05312b72a14150b83f 100644
--- a/api/auth/Register.php
+++ b/api/auth/Register.php
@@ -24,7 +24,12 @@ $stmt->bind_param("sss", $username, $email, $en_password);
if ($stmt->execute() === TRUE) {
try {
- $arg0 = $username;
+ $query = "SELECT IFNULL(MAX(id), 0) + 1 AS next_user_id FROM users";
+ $result = $conn->query($query);
+ $row = $result->fetch_assoc();
+ $nextUserId = $row['next_user_id'];
+
+ $arg0 = $nextUserId;
$arg1 = password_hash($password, PASSWORD_BCRYPT);
$requestBody = '<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/">
<Body>