#vulnerable code 
                                public Object doGenerate(Parameterizable parameterizedType) {
        Queue returnedQueue = (Queue) RandomFactory.getRandomValue(parameterizedType.getType());
        returnedQueue.clear();
        CollectionHelper.buildCollections(returnedQueue, parameterizedType.getParameterTypes().get(0));
        return returnedQueue;
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public Object doGenerate(Parameterizable parameterizedType) {
        Queue returnedQueue = (Queue) RandomFactory.getRandomValue(parameterizedType.getType());
        CollectionHelper.buildCollections(returnedQueue, parameterizedType.getParameterTypes().get(0));
        return returnedQueue;
    }