replace userId to childId

src/routes/api/getGameScore.js

@@ -19,7 +19,7 @@ async function main() {
 
         const { userId, gameName, gameID } = req.body;
             const gameData = await collection.findOne({
-                userId: userId,
+                childId: userId,
                 gameName: gameName,
                 gameID: gameID
             });