#vulnerable code 
                                @Test
    public void testRenderEntryAndMakeSureMapIsCreated() {  
        String stringy = new String("stringy");
        
        Entry<String, Object> entry 
            = new SimpleImmutableEntry("stringy", stringy);
        
        // step 1: add one object.
        Result result = new Result(200);
        result.render(entry);
        Map<String, Object> resultMap = (Map) result.getRenderable();       
        
        assertEquals(stringy, resultMap.get("stringy"));
      
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void testRenderEntryAndMakeSureMapIsCreated() {  
        String stringy = new String("stringy");
        
        // step 1: add one object.
        Result result = new Result(200);
        result.render("stringy", stringy);
        Map<String, Object> resultMap = (Map) result.getRenderable();       
        
        assertEquals(stringy, resultMap.get("stringy"));
      
    }