diff --git a/ocpp_v16/configuration_test.go b/ocpp_v16/configuration_test.go
index fd655e0..440d932 100644
--- a/ocpp_v16/configuration_test.go
+++ b/ocpp_v16/configuration_test.go
@@ -74,6 +74,7 @@ func (s *OcppConfigTest) TestGetConfigurationValue() {
 	// Invalid key
 	value, err = s.config.GetConfigurationValue("Test4")
 	s.Assert().Error(err)
+	s.Assert().Nil(value)
 }
 
 func (s *OcppConfigTest) TestGetVersion() {
diff --git a/ocpp_v16/manager.go b/ocpp_v16/manager.go
index 9c3575e..1531243 100644
--- a/ocpp_v16/manager.go
+++ b/ocpp_v16/manager.go
@@ -29,12 +29,11 @@ type (
 	}
 
 	ManagerV16 struct {
-		supportedProfiles []string
-		ocppConfig        *Config
-		mandatoryKeys     []Key
-		keyValidator      KeyValidator
-		onUpdateHandlers  map[Key]OnUpdateHandler
-		mu                sync.Mutex
+		ocppConfig       *Config
+		mandatoryKeys    []Key
+		keyValidator     KeyValidator
+		onUpdateHandlers map[Key]OnUpdateHandler
+		mu               sync.Mutex
 	}
 )