salve sto tentando di aggiornare il profilo utente  ma mi da errore nel else chiedo aiuto grazie
	
	
	
		
				
			
		Codice:
	
	<?php
session_start();
# check if the user is logged in
if(isset($_POST['submit'])){
   
    # database connection file
    include 'app/db.conn.php';
    # get the logged in user's username from SESSION
    $user_id = $_SESSION['user_id'];
    $username = $_POST['username'];
    $email = $_POST['email'];
    $sql = "UPDATE users SET username=?, email=? WHERE user_id=?";
    $stmt= $conn->prepare($sql);
    $stmt->execute([$username, $email, $user_id]);
{
}else { //qui da errore
    header("Location: profilo.php");
    exit;
}
?>
---------------------------------------
<form method="post" action="updateuser.php" >
                        <!-- Form Group (username)-->
                        <div class="mb-3">
                           
                        </div>
                        <!-- Form Row-->
                        <div class="row gx-3 mb-3">
                            <!-- Form Group (first name)-->
                            <div class="col-md-6">
                                
                            </div>
                            <!-- Form Group (last name)-->
                            <div class="col-md-6">
                                <label class="small mb-1" for="inputLastName"></label>
                               
                            </div>
                        </div>
                        <!-- Form Row        -->
                        <div class="row gx-3 mb-3">
                        </div>
                        <!-- Form Group (email address)-->
                        <div class="mb-3">
                            <label class="small mb-1" for="inputEmailAddress">username</label>
                            <input type="text" class="form-control" name="username" style="width:20em;" placeholder="Username" value="<?=$user['username']?>" required />
                        </div>
                        <div class="mb-3">
                            <label class="small mb-1" for="inputEmailAddress">Tua email</label>
                            <input type="text" class="form-control" name="email" style="width:20em;" placeholder="Email" value="<?=$user['email']?>" required />
                        </div>
                        <!-- Form Row-->
                        <div class="row gx-3 mb-3">
                        </div>
                        <!-- Save changes button-->
                        <input type="submit" name="submit" value="Aggiorna" />
                    </form>