diff --git a/lib/NGCP/Template/Plugin/Utils.pm b/lib/NGCP/Template/Plugin/Utils.pm
index 21adc8b5..3c40f07a 100644
--- a/lib/NGCP/Template/Plugin/Utils.pm
+++ b/lib/NGCP/Template/Plugin/Utils.pm
@@ -40,6 +40,7 @@ sub to_config_general {
 
 sub to_yaml {
     my ($self, @params) = @_;
+    return q{} unless $params[0];
     return YAML::XS::Dump($params[0]);
 }