diff --git a/src/Form/CLUListingUsers.php b/src/Form/CLUListingUsers.php
index c06758e..930d766 100644
--- a/src/Form/CLUListingUsers.php
+++ b/src/Form/CLUListingUsers.php
@@ -77,12 +77,17 @@ class CLUListingUsers extends FormBase {
    */
   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.'));
+    }
   }
 
   /**
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
+
     $uid = $form_state->getValues()['table'];
     foreach ($uid as $delete_session_uid) {
       if ($delete_session_uid != 0) {