diff --git a/htdocs/telephonie/stats/graph/comm.nbminutes.class.php b/htdocs/telephonie/stats/graph/comm.nbminutes.class.php
index 6c14be221d8..327e65fa7fb 100644
--- a/htdocs/telephonie/stats/graph/comm.nbminutes.class.php
+++ b/htdocs/telephonie/stats/graph/comm.nbminutes.class.php
@@ -108,7 +108,8 @@ class GraphCommNbMinutes extends GraphBar{
       }
     else 
       {
-	dolibarr_syslog("Error");
+	dolibarr_syslog("Error in GraphCommNbMinutes");
+	dolibarr_syslog($sql);
       }
   }
 }