#vulnerable code 
                             @Test
	public void parseXml_empty() {
		ICalParameters params = new ICalParameters();

		Element element = xcalPropertyElement(marshaller, "");
		Result<IntegerProperty> result = marshaller.parseXml(element, params);

		IntegerProperty prop = result.getValue();
		assertNull(prop.getValue());
		assertWarnings(0, result.getWarnings());
	} 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Test
	public void parseXml_empty() {
		Result<IntegerProperty> result = parseXCalProperty("", marshaller);

		IntegerProperty prop = result.getValue();
		assertNull(prop.getValue());
		assertWarnings(0, result.getWarnings());
	}