diff --git a/includes/polling/functions.inc.php b/includes/polling/functions.inc.php
index d2cc571618..ca9b767a1d 100644
--- a/includes/polling/functions.inc.php
+++ b/includes/polling/functions.inc.php
@@ -18,7 +18,9 @@ function poll_sensor($device, $class, $unit)
           if ($debug) echo("Attempt $i ");
           $sensor_value = trim(str_replace("\"", "", snmp_get($device, $sensor['sensor_oid'], "-OUqnv", "SNMPv2-MIB")));
           preg_match("/[\d\.]+/",$sensor_value,$temp_response);
-          $sensor_value = $temp_response[0];
+          if (!empty($temp_response[0])) {
+              $sensor_value = $temp_response[0];
+          }
 
           if (is_numeric($sensor_value) && $sensor_value != 9999) break; # TME sometimes sends 999.9 when it is right in the middle of an update;
           sleep(1); # Give the TME some time to reset