diff --git a/lib/SNMP/Info/Layer3/Eltex.pm b/lib/SNMP/Info/Layer3/Eltex.pm
index bc6cf337..35a2a18c 100644
--- a/lib/SNMP/Info/Layer3/Eltex.pm
+++ b/lib/SNMP/Info/Layer3/Eltex.pm
@@ -51,7 +51,7 @@ sub model {
         $descr =~ /Eltex\s(.*)\ssoftware\sversion\s(.*)\sbuild\s(\d+)/;
         return $1;
     }
-    elsif ($model !~ /MES\d+/) {
+    elsif (defined $model and $model !~ /MES\d+/) {
         $model = $obj->model_oid_mes . ' ' . $obj->model_oid || undef;
     }
     if (defined $model and defined $hw) {