#vulnerable code 
                                @Test
    public void shouldBeAbleToConvertNumbers(){
        assertThat(((Character) converter.convert("r", char.class, errors, bundle)).charValue(), is(equalTo('r')));
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void shouldBeAbleToConvertNumbers(){
        assertThat(((Character) converter.convert("r", char.class, bundle)).charValue(), is(equalTo('r')));
    }