diff --git a/pkg/mapper/mapper.go b/pkg/mapper/mapper.go
index 1471444..0c31d89 100644
--- a/pkg/mapper/mapper.go
+++ b/pkg/mapper/mapper.go
@@ -233,6 +233,10 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
+	if m.Logger == nil {
+		m.Logger = log.NewNopLogger()
+	}
+
 	m.Defaults = n.Defaults
 	m.Mappings = n.Mappings
 
@@ -259,10 +263,6 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 		m.MappingsCount.Set(float64(len(n.Mappings)))
 	}
 
-	if m.Logger == nil {
-		m.Logger = log.NewNopLogger()
-	}
-
 	return nil
 }