diff -up ./runtime/msg.c.orig ./runtime/msg.c
--- a/runtime/msg.c	2015-01-15 19:30:02.351699869 +0100
+++ b/runtime/msg.c	2015-01-15 19:35:58.667176642 +0100
@@ -4267,22 +4267,19 @@ jsonPathFindParent(struct json_object *j
 	RETiRet;
 }
 
+/* In case of duplicate names, the original value is kept. */
 static rsRetVal
 jsonMerge(struct json_object *existing, struct json_object *json)
 {
-	/* TODO: check & handle duplicate names */
 	DEFiRet;
 	struct json_object_iter it;
 
-	json_object_object_foreachC(json, it) {
-		json_object_object_add(existing, it.key,
-			json_object_get(it.val));
+	json_object_object_foreachC(existing, it) {
+		json_object_object_add(json, it.key, json_object_get(it.val));
 	}
-	/* note: json-c does ref counting. We added all descandants refcounts
-	 * in the loop above. So when we now free(_put) the root object, only
-	 * root gets freed().
-	 */
-	json_object_put(json);
+
+	iRet = jsonMerge(existing, json);
+
 	RETiRet;
 }