Nullptr check added on subkey

mp/src/game/shared/momentum/util/jsontokv.cpp

@@ -28,9 +28,13 @@ void CJsonToKeyValues::MapNode(JsonNode *node, KeyValues *kv)
             // If what we're going to parse is an object, then we need to add it as a subkey.
             if (i->value.getTag() == JSON_OBJECT || i->value.getTag() == JSON_ARRAY)
             {
-                kv->AddSubKey(MapNode(i));
+                KeyValues *pSub = MapNode(i);
+                if (pSub)
+                {
+                    kv->AddSubKey(pSub);
+                }
             }
-            else //Otherwise (string, numbers, booleans) we just add them as an entry of the current key
+            else // Otherwise (string, numbers, booleans) we just add them as an entry of the current key
             {
                 MapNode(i, kv);
             }
@@ -57,7 +61,7 @@ KeyValues *CJsonToKeyValues::MapNode(JsonNode *node)
 
     // @Ruben: When node->key is null on the json, key is not nullptr, but 0xffeeffee.
     // MOM_TODO: Is it always that adress? If not, when / how does it change?
-    
+
     // Parent keyvalue.
     KeyValues *pNodeValues =
         new KeyValues((node->key == nullptr || POINTER_TO_INT(node->key) == 0xffeeffee) ? nullptr : node->key);