Image wont display for my user

<?php
            if(isset($_SESSION['id']) ) {
            ($_SESSION['id']) {
                //echo "you're login";
            }
                echo "<form action='upload.php' enctype='multipart/form-data' method='post'>
                    <br>Qr Code:
                    <p><input type='file' name='file' >
                    <p><input type='submit' value='Upload' name='submit'>
                      </form>";
                            }
                ?>
 <?php
                $statusMsg = '';
                // File upload path
                $targetDir = "qr_code/";
                $fileName = basename($_FILES["file"]["name"]);
                $targetFilePath = $targetDir . $fileName;
                $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
                if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
                    // Allow certain file formats
                    $allowTypes = array('jpg','png','jpeg','gif','JPG','PNG','GIF','JPEG');
                    if(in_array($fileType, $allowTypes)){
                        // Upload file to server
                        if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){
                            // Insert image file name into database
                            $insert = $db->query("INSERT into qr (user_id,file_name, uploaded_on) 
                                        VALUES ('".$_SESSION['id']."','".$fileName."', NOW())");
                            if($insert){
                                $statusMsg = "The file ".$fileName. " has been uploaded successfully.";
                                    header ("Location:employee.php?uploadsuccess");
                            }else{
                                $statusMsg = "File upload failed, please try again.";
                            }
                        }else{
                            $statusMsg = "Sorry, there was an error uploading your file.";
                        }
                    }else{
                        $statusMsg = 'Sorry, only JPG, JPEG, PNG, GIF files are allowed to upload.';
                    }
                }else{
                    $statusMsg = 'Please select a file to upload.';
                }
                // Display status message
                echo $statusMsg;
                ?>

<?php
                     $query = $db->query("SELECT * FROM qr where user_id='".$_SESSION['id']."' ORDER BY uploaded_on DESC limit 1 ");
                        if($query->num_rows > 0){
                            while($row = $query->fetch_assoc()){
                                $imageURL = 'qr_code/'.$row["file_name"];
                        ?>
                            <img src="<?php echo $imageURL; ?>" alt="" />
                        <?php }
                        }else{ ?>
                              <img src="images/qr.png" alt="" />

                    <?php } ?>