diff --git a/main/session/add_users_to_session.php b/main/session/add_users_to_session.php
index 2bba3edbe2..4c33105e2c 100644
--- a/main/session/add_users_to_session.php
+++ b/main/session/add_users_to_session.php
@@ -753,7 +753,7 @@ $newLinks .= Display::url(
                     if ($ajax_search) {
                         ?>
                         <div class="separate-action">
-                            <button class="btn btn-primary" type="button"
+                            <button name="remove_user" class="btn btn-primary" type="button"
                                     onclick="remove_item(document.getElementById('destination_users'))">
                                 <em class="fa fa-chevron-left"></em>
                             </button>
@@ -762,14 +762,14 @@ $newLinks .= Display::url(
                     } else {
                         ?>
                         <div class="separate-action">
-                            <button class="btn btn-primary" type="button"
+                            <button name="add_user" class="btn btn-primary" type="button"
                                     onclick="moveItem(document.getElementById('origin_users'), document.getElementById('destination_users'))"
                                     onclick="moveItem(document.getElementById('origin_users'), document.getElementById('destination_users'))">
                                 <em class="fa fa-chevron-right"></em>
                             </button>
                         </div>
                         <div class="separate-action">
-                            <button class="btn btn-primary" type="button"
+                            <button name="remove_user" class="btn btn-primary" type="button"
                                     onclick="moveItem(document.getElementById('destination_users'), document.getElementById('origin_users'))"
                                     onclick="moveItem(document.getElementById('destination_users'), document.getElementById('origin_users'))">
                                 <em class="fa fa-chevron-left"></em>
@@ -779,10 +779,10 @@ $newLinks .= Display::url(
                         <?php
                     }
                     if (!empty($addProcess)) {
-                        echo '<button class="btn btn-success" type="button" value="" onclick="valide()" >'
+                        echo '<button name="next" class="btn btn-success" type="button" value="" onclick="valide()" >'
                             .get_lang('FinishSessionCreation').'</button>';
                     } else {
-                        echo '<button class="btn btn-success" type="button" value="" onclick="valide()" >'
+                        echo '<button name="next" class="btn btn-success" type="button" value="" onclick="valide()" >'
                             .get_lang('SubscribeUsersToSession').'</button>';
                     }
                     ?>