diff --git a/main/admin/add_users_to_session.php b/main/admin/add_users_to_session.php
index 2199ff0e6d..dbbdfa0cc1 100644
--- a/main/admin/add_users_to_session.php
+++ b/main/admin/add_users_to_session.php
@@ -31,14 +31,9 @@ $interbreadcrumb[] = array('url' => "resume_session.php?id_session=".$id_session
 
 // Database Table Definitions
 $tbl_session						= Database::get_main_table(TABLE_MAIN_SESSION);
-$tbl_session_rel_class				= Database::get_main_table(TABLE_MAIN_SESSION_CLASS);
-$tbl_session_rel_course				= Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
-$tbl_session_rel_course_rel_user	= Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
 $tbl_course							= Database::get_main_table(TABLE_MAIN_COURSE);
 $tbl_user							= Database::get_main_table(TABLE_MAIN_USER);
 $tbl_session_rel_user				= Database::get_main_table(TABLE_MAIN_SESSION_USER);
-$tbl_class							= Database::get_main_table(TABLE_MAIN_CLASS);
-$tbl_class_user						= Database::get_main_table(TABLE_MAIN_CLASS_USER);
 
 // setting the name of the tool
 $tool_name = get_lang('SubscribeUsersToSession');
@@ -667,4 +662,4 @@ function makepost(select){
 </script>
 <?php
 /*		FOOTER */
-Display::display_footer();
+Display::display_footer();
\ No newline at end of file