output: #fixed code
                                  @Test
      public void cannotSearchAfterDeletingIndexes() {
          User user = new User();
          user.setAge(88);
          JOhm.save(user);
  
          user.setAge(77); // younger
          JOhm.save(user);
  
          user.setAge(66); // younger still
          JOhm.save(user);
  
          Long id = user.getId();
  
          assertNotNull(JOhm.get(User.class, id));
  
          List<User> users = JOhm.find(User.class, "age", 88);
          assertEquals(0, users.size()); // index already updated
          users = JOhm.find(User.class, "age", 77);
          assertEquals(0, users.size()); // index already updated
          users = JOhm.find(User.class, "age", 66);
          assertEquals(1, users.size());
  
          JOhm.delete(User.class, id);
  
          users = JOhm.find(User.class, "age", 88);
          assertEquals(0, users.size());
          users = JOhm.find(User.class, "age", 77);
          assertEquals(0, users.size());
          users = JOhm.find(User.class, "age", 66);
          assertEquals(0, users.size());
  
          assertNull(JOhm.get(User.class, id));
      }
input: #vulnerable code 
                                  @Test
      public void cannotSearchAfterDeletingIndexes() {
          User user = new User();
          user.setAge(88);
          JOhm.save(user);
  
          user.setAge(77); // younger
          JOhm.save(user);
  
          user.setAge(66); // younger still
          JOhm.save(user);
  
          int id = user.getId();
  
          assertNotNull(JOhm.get(User.class, id));
  
          List<User> users = JOhm.find(User.class, "age", 88);
          assertEquals(0, users.size()); // index already updated
          users = JOhm.find(User.class, "age", 77);
          assertEquals(0, users.size()); // index already updated
          users = JOhm.find(User.class, "age", 66);
          assertEquals(1, users.size());
  
          JOhm.delete(User.class, id);
  
          users = JOhm.find(User.class, "age", 88);
          assertEquals(0, users.size());
          users = JOhm.find(User.class, "age", 77);
          assertEquals(0, users.size());
          users = JOhm.find(User.class, "age", 66);
          assertEquals(0, users.size());
  
          assertNull(JOhm.get(User.class, id));
      } 
                              #location 13 
                              #vulnerability type NULL_DEREFERENCE