diff --git a/example/1.6/cp/handler.go b/example/1.6/cp/handler.go
index a0f34c70..ecfe1566 100644
--- a/example/1.6/cp/handler.go
+++ b/example/1.6/cp/handler.go
@@ -99,7 +99,7 @@ func (handler *ChargePointHandler) OnGetConfiguration(request *core.GetConfigura
 	for _, key := range request.Key {
 		configKey, ok := handler.configuration[key]
 		if !ok {
-			unknownKeys = append(unknownKeys, *configKey.Value)
+			unknownKeys = append(unknownKeys, key)
 		} else {
 			resultKeys = append(resultKeys, configKey)
 		}