Hooking to Main Class

So i keep getting nullpointer and i know it is because the vairable m is really null...But How can I get it not to be? Here is my code. Im trying to use Main as m.

Code:

   
    Main m;
    public MYSQL_InsertPlayerData(Main main) {
        this.m = main;
    }
    private  int air;
    private  int level;
    private  String rank;
    private  int money;
   
    // CHECK IF PLAYER EXIST===========================
    public boolean playerExists(String uuid) throws SQLException {
        PreparedStatement rs = m.c.prepareStatement("SELECT * FROM Atlas WHERE UUID='"+ uuid + "';");
            rs.getResultSet().next();
            if (rs.getResultSet().next()) {
                return rs.getResultSet().getString("UUID") != null;
            }
        return false;
    }