diff --git a/redfish-core/lib/message_registries.hpp b/redfish-core/lib/message_registries.hpp
index d0757b3..41713ce 100644
--- a/redfish-core/lib/message_registries.hpp
+++ b/redfish-core/lib/message_registries.hpp
@@ -213,6 +213,7 @@
                     if (message->second.numberOfArgs > 0)
                     {
                         nlohmann::json& messageParamArray = obj["ParamTypes"];
+                        messageParamArray = nlohmann::json::array();
                         for (const char* str : message->second.paramTypes)
                         {
                             if (str == nullptr)