#vulnerable code 
                                @Override
    public Mapper process(ProcessorContext context, TypeElement mapperTypeElement, Mapper mapper) {
        String componentModel = MapperPrism.getInstanceOn( mapperTypeElement ).componentModel();

        if ( !componentModel.equals( "cdi" ) ) {
            return mapper;
        }

        mapper.addAnnotation( new Annotation( new Type( "javax.enterprise.context", "ApplicationScoped" ) ) );

        ListIterator<MapperReference> iterator = mapper.getReferencedMappers().listIterator();
        while ( iterator.hasNext() ) {
            MapperReference reference = iterator.next();
            iterator.remove();
            iterator.add( new CdiMapperReference( reference.getMapperType() ) );
        }

        return mapper;
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public Mapper process(ProcessorContext context, TypeElement mapperTypeElement, Mapper mapper) {
        String componentModel = MapperPrism.getInstanceOn( mapperTypeElement ).componentModel();
        String effectiveComponentModel = OptionsHelper.getEffectiveComponentModel(
            context.getOptions(),
            componentModel
        );

        if ( !"cdi".equalsIgnoreCase( effectiveComponentModel ) ) {
            return mapper;
        }

        mapper.addAnnotation( new Annotation( new Type( "javax.enterprise.context", "ApplicationScoped" ) ) );

        ListIterator<MapperReference> iterator = mapper.getReferencedMappers().listIterator();
        while ( iterator.hasNext() ) {
            MapperReference reference = iterator.next();
            iterator.remove();
            iterator.add( new CdiMapperReference( reference.getMapperType() ) );
        }

        return mapper;
    }