#vulnerable code 
                             private Mapping getMapping(MappingPrism mapping) {
		Type converterType = typeUtil.retrieveType( mapping.converter() );
		return new Mapping(
				mapping.source(),
				mapping.target(),
				converterType.getName().equals( "NoOpConverter" ) ? null : converterType
		);
	} 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             private Mapping getMapping(MappingPrism mapping) {
		return new Mapping( mapping.source(), mapping.target() );
	}