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There are multiple reasons why you might get a null result from vertx-mysql-client. Here are some possible causes:

Invalid query: The query you executed might be invalid, or there might be a syntax error. Make sure to double-check your query and ensure it is accurate.
Empty result set: There might be no results in the specified table or the query might not have returned anything. Check the query and the database to ensure there are records that match the query criteria.
Connection error: There might be a problem with the database connection. Check to make sure that the database is up and running, and that you have the correct login credentials.
Bug in the code: There might be a bug in your code that is causing the null result. Check your code and make sure it is correct.

To determine the cause of the null result, you can try logging the query and any relevant information, such as the database connection, and see if there are any errors or unexpected behavior. You can also try executing the query directly in the database to see if it returns any results. If none of that works, you might need to consult the official documentation and reach out to the vertx-mysql-client community for support.