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If snapshot.val() is null in Vercel and Firebase Realtime Database during the build deployment, it means that there is no data available in the database at the time of the deployment. This can happen if the database has not been populated with any data yet, or if some external factors caused the data to be unavailable during the deployment process. It is important to handle this scenario in your code and ensure that your application can function properly even in the absence of database data.