diff --git a/main/work/work.lib.php b/main/work/work.lib.php
index 9506a586f4..e077669b5e 100755
--- a/main/work/work.lib.php
+++ b/main/work/work.lib.php
@@ -104,8 +104,9 @@ function display_action_links($cur_dir_path, $always_show_tool_options, $always_
 				$display_output .=	"<a href=\"".api_get_self()."?".api_get_cidreq()."&amp;curdirpath=".$cur_dir_path."&amp;origin=$origin&amp;gradebook=$gradebook&amp;list=with\">".
 				Display::return_icon('check.gif', get_lang('ViewUsersWithTask')).' '.get_lang('ViewUsersWithTask').
 				"</a>\n";
-
-				$display_output .=	"<a href=\"".api_get_self()."?".api_get_cidreq()."&amp;curdirpath=".$cur_dir_path."&amp;origin=$origin&amp;gradebook=$gradebook&amp;list=without&amp;action=send_mail&amp;sec_token=".$_SESSION['sec_token']."\">".
+				
+				$_SESSION['token'] = time();				
+				$display_output .=	"<a href=\"".api_get_self()."?".api_get_cidreq()."&amp;curdirpath=".$cur_dir_path."&amp;origin=$origin&amp;gradebook=$gradebook&amp;list=without&amp;action=send_mail&amp;sec_token=".$_SESSION['token']."\">".
 				Display::return_icon('messagebox_warning.gif', get_lang('ReminderMessage')).' '.get_lang('ReminderMessage').
 				"</a>\n";
 			}
diff --git a/main/work/work.php b/main/work/work.php
index ec11d3930a..7d103a245e 100755
--- a/main/work/work.php
+++ b/main/work/work.php
@@ -217,8 +217,12 @@ if (isset($_GET['list']) && Security::remove_XSS($_GET['list'])=='without') {
 	$display_list_users_without_publication= false;
 }
 
-if (isset($_GET['action']) && $_GET['action'] == 'send_mail') {
-	send_reminder_users_without_publication($publication['id']);
+
+if (isset($_GET['action']) && $_GET['action'] == 'send_mail') {	
+	if ($_GET['sec_token'] == $_SESSION['token']) {
+		send_reminder_users_without_publication($publication['id']);
+		unset($_SESSION['token']);	
+	}
 } 
 
 api_protect_course_script(true);