diff --git a/public/js/more-info.js b/public/js/more-info.js
index 80481ba..34c86f9 100644
--- a/public/js/more-info.js
+++ b/public/js/more-info.js
@@ -131,7 +131,7 @@ function moreInfo() {
           let chartData = {};
           // const labels = data.map(item => new Date(item.dt.replaceAll(/[T-Z]/g, ' ').trim()));
           const values = data.map(item => {return {x: item.dt, y: item.val}});
-          console.debug(values);
+          console.debug("poseidon values: ", values);
           chartData = {
             datasets: [{
               label: 'Pressure',
diff --git a/src/Controllers/AuthController.php b/src/Controllers/AuthController.php
index 9ab604b..59b5e14 100644
--- a/src/Controllers/AuthController.php
+++ b/src/Controllers/AuthController.php
@@ -52,8 +52,6 @@ class AuthController {
 
 
     public function guestSignin() {
-    //    header('Location: /'); 
-      
         // Prevent invalid email input
         $email = $_POST['username'];
         if (!valid_email($email)) {
@@ -71,6 +69,12 @@ class AuthController {
           header('HTTP/1.1 400 Bad Request');
           exit(400);
         }
+
+        if (!self::isEmail($email)) {
+            header('HTTP/1.1 422 Unprocessable Entity');
+            header('Location: login');
+            exit(422);
+        }
     
         // Handle guest login
         if (isset($_POST['username'])) {
@@ -99,16 +103,19 @@ class AuthController {
         exit();
     }
 
+    private function isEmail($email) {
+        return filter_var($email, FILTER_VALIDATE_EMAIL);
+    }
+
 
     private function insertGuestUser($email) {
-      $uid = guidv4($email);
-      $sql = "INSERT INTO webapp.users (email, password, origin, geo_id)
-              VALUES ('${email}', '', 'GUEST', '${uid}')
+      $sql = "INSERT INTO webapp.users (email, origin, password)
+              VALUES ('${email}', 'GUEST', '') 
               ON CONFLICT (email) DO UPDATE
-              SET geo_id = EXCLUDED.geo_id,
-                  last_login = now()";
+              SET last_login = now()";
 
-      return json_decode(PgSql::insert($sql, 'geo_id'))->geo_id;
+        $res = PgSql::insert($sql, 'geo_id');
+        return json_decode($res)->geo_id;
     }
 
     private function insertGuestGroup($id) {