diff --git a/src/Form/CLUListingUsers.php b/src/Form/CLUListingUsers.php
index c06758e..1e394b3 100644
--- a/src/Form/CLUListingUsers.php
+++ b/src/Form/CLUListingUsers.php
@@ -30,10 +30,10 @@ class CLUListingUsers extends FormBase {
   public function buildForm(array $form, FormStateInterface $form_state) {
     $user = \Drupal::currentUser();
     $header = [
-      'user_id' => t('User Id'),
-      'user_name' => t('User Name'),
-      'loggedin_since' => t('Loggedin since'),
-      'action' => t('Action'),
+      'user_id' => t('USER ID'),
+      'user_name' => t('USERNAME'),
+      'loggedin_since' => t('Loggedin Since'),
+      'action' => t('OPERATIONS'),
     ];
     $query = db_select('sessions', 's');
     $query->join('users_field_data', 'u', 's.uid = u.uid');
@@ -48,7 +48,15 @@ class CLUListingUsers extends FormBase {
       $action = '';
       if ($user->id() != $result->uid) {
         $url = Url::fromUserInput('/admin/people/clu/' . $result->uid);
-        $action = render(Link::fromTextAndUrl("End Session", $url)->toRenderable());
+        $link_options = array(
+            'attributes' => array(
+                'class' => array(
+                    'button',
+                ),
+            ),
+        );
+        $url->setOptions($link_options);
+        $action = \Drupal::l(t('End session'), $url);
       }
       $output[$result->uid] = array(
         'user_id' => $result->uid,
@@ -76,7 +84,10 @@ class CLUListingUsers extends FormBase {
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-
+    $value_checked = $form_state->getCompleteForm()['table']['#value'];
+    if (empty($value_checked)){
+      $form_state->setErrorByName('clu_table', $this->t('please select atleast one user to terminate the session.'));
+    }
   }
 
   /**