diff --git a/app/xml_cdr/xml_cdr.php b/app/xml_cdr/xml_cdr.php
index f59dcaba48..8941eca628 100644
--- a/app/xml_cdr/xml_cdr.php
+++ b/app/xml_cdr/xml_cdr.php
@@ -906,7 +906,7 @@
 					}
 				//mos (mean opinion score)
 					if (permission_exists("xml_cdr_mos")) {
-						if(!empty($row['rtp_audio_in_mos'])) {
+						if(!empty($row['rtp_audio_in_mos']) && is_numeric($row['rtp_audio_in_mos'])) {
 							$title = " title='".$text['label-mos_score-'.round($row['rtp_audio_in_mos'])]."'";
 							$value = $row['rtp_audio_in_mos'];
 						}