diff --git a/includes/polling/functions.inc.php b/includes/polling/functions.inc.php
index 3c9f5940eb..86c521a646 100644
--- a/includes/polling/functions.inc.php
+++ b/includes/polling/functions.inc.php
@@ -277,7 +277,7 @@ function poll_device($device, $options)
         // Update device_groups
         UpdateGroupsForDevice($device['device_id']);
 
-        if (!$options['m']) {
+        if (!isset($options['m'])) {
             // FIXME EVENTLOGGING -- MAKE IT SO WE DO THIS PER-MODULE?
             // This code cycles through the graphs already known in the database and the ones we've defined as being polled here
             // If there any don't match, they're added/deleted from the database.