#vulnerable code 
                                public void testToMap() throws SQLException {

        int rowCount = 0;
        Map m = null;
        while (this.rs.next()) {
            m = processor.toMap(this.rs);
            assertNotNull(m);
            assertEquals(COLS, m.keySet().size());
            rowCount++;
        }

        assertEquals(ROWS, rowCount);
        assertEquals("4", m.get("One")); // case shouldn't matter
        assertEquals("5", m.get("two"));
        assertEquals("6", m.get("THREE"));
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void testToMap() throws SQLException {

        assertTrue(this.rs.next());
        Map m = processor.toMap(this.rs);
        assertEquals(COLS, m.keySet().size());
        assertEquals("1", m.get("one"));
        assertEquals("2", m.get("TWO"));
        assertEquals("3", m.get("Three"));
            
        assertTrue(this.rs.next());
        m = processor.toMap(this.rs);
        assertEquals(COLS, m.keySet().size());

        assertEquals("4", m.get("One")); // case shouldn't matter
        assertEquals("5", m.get("two"));
        assertEquals("6", m.get("THREE"));
            
        assertFalse(this.rs.next());
    }