Selamlar. Sil butonuna bastığımda beyaz sayfa oluyor. Kodda nerede hata var bulamadım. Hayırsever bir arkadaşın desteğine ihtiyacım var

<div class="content-wrapper">
  <!-- Content Header (Page header) -->
  <section class="content-header">
    <div class="container-fluid">
      <div class="row mb-2">
        <div class="col-sm-6">
          <h1>Araç Listele</h1>
        </div>
        <div class="col-sm-6">
          <ol class="breadcrumb float-sm-right">
            <li class="breadcrumb-item"><a href="#">Anasayfa</a></li>
            <li class="breadcrumb-item active">Duyuru Lislete</li>
          </ol>
        </div>
      </div>
    </div><!-- /.container-fluid -->
  </section>

        <!-- Default box -->
        <div class="card">
          <div class="card-header">
            <h3 class="card-title">Araç Listesi</h3>

            <div class="card-tools">
              <button type="button" class="btn btn-tool" data-card-widget="collapse" title="Collapse">
                <i class="fas fa-minus"></i>
              </button>
              <button type="button" class="btn btn-tool" data-card-widget="remove" title="Remove">
                <i class="fas fa-times"></i>
              </button>
            </div>
          </div>
          <div class="card-body p-0">
            <table id="example1" class="table table-bordered table-hover" >
              <thead class="text-center">
                <tr>
                  <th style="width: 5%">
                    Plaka
                  </th>
                  <th style="width: 7%">
                    Marka
                  </th>
                  <th style="width: 7%">
                    Model
                  </th>

                  <th style="width: 7%">
                    Muayene B.T.
                  </th>

                  <th style="width: 7%">
                    Sigorta B.T.
                  </th>

                  <th style="width: 5%">
                    Araç Yaşı
                  </th>

                  <th style="width: 5%">
                    Sigorta
                  </th>

                  <th style="width: 10%" class="text-center">
                    İşlem
                  </th>

               </tr>
             </thead>
             <tbody class="text-center">

              <?php 
              if($user_rol==1){
                $sorgu = $db->query("SELECT * FROM araclar ");
                while ($cikti = $sorgu->fetch(PDO::FETCH_ASSOC)) {
                  echo '
                  <tr>
                  <td>
                   '.$cikti["plaka"].'
                  </td>
                  <td>
                  <a>
                  '.$cikti["marka"].'
                  </a>
                  </td>
                  <td>
                  <ul class="list-inline">
                  <li class="list-inline-item">
                  '.$cikti["model"].'
                  </li>
                  </ul>
                  </td>

                  <td>
                  <ul class="list-inline">
                  <li class="list-inline-item">
                  '.$cikti["muayene"].'
                  </li>
                  </ul>
                  </td>

                  <td>
                  <ul class="list-inline">
                  <li class="list-inline-item">
                  '.$cikti["sigorta_bitis_tarihi"].'
                  </li>
                  </ul>
                  </td>

                  <td>
                  <ul class="list-inline">
                  <li class="list-inline-item">
                  '.$cikti["arac_yasi"].'
                  </li>
                  </ul>
                  </td>

                  <td class="project-state">';
                  if($cikti["sigorta_varmi"]==1){
                    echo '<span>VAR</span>';
                  }
                  else if($cikti["sigorta_varmi"]==2){
                    echo '<span>YOK</span>';
                  }

                  '
                  </td>

                  
    


                  <td>
                  <ul class="list-inline">
                  <li class="list-inline-item">
                  ';?>

                  

                  <?php echo'</li>
                  </ul>
                  </td>
                  <td class="project-actions text-right">
                  
                  <a class="btn btn-info btn-sm" href="?sayfa=arac-duzenle&arac_id='.$cikti["id"].'">
                  <i class="fas fa-pencil-alt">
                  </i>
                  Düzenle
                  </a>
                  ';?>

                  
                  <?php echo'
                  <a class="btn btn-danger btn-sm" href="?sayfa=sil&url=arac_sil&id='.$cikti["id"].'" onclick="return confirmDelete(this);">
                  <i class="fas fa-trash">
                  </i>
                  Sil
                  </a>
                  </td>
                  </tr>

                  
                  ';

                }
              }


              ?>
            </tbody>
          </table>
        </div>
        <!-- /.card-body -->
        <!-- /.card -->

      </section>
      <!-- /.content -->
    </div>