diff --git a/web/skins/classic/views/_monitor_filters.php b/web/skins/classic/views/_monitor_filters.php
index 0656773f1..6f94580e2 100644
--- a/web/skins/classic/views/_monitor_filters.php
+++ b/web/skins/classic/views/_monitor_filters.php
@@ -68,7 +68,6 @@ if ( count($GroupsById) ) {
 
 $selected_monitor_ids = isset($_SESSION['MonitorId']) ? $_SESSION['MonitorId'] : array();
 if ( ! is_array( $selected_monitor_ids ) ) {
-  Warning("Turning selected_monitor_ids into an array $selected_monitor_ids");
   $selected_monitor_ids = array($selected_monitor_ids);
 }