Exception with CDATA

not sure if I am using jibx incorrectly. But I get an exception in the foollowing class :
package org.jibx.runtime.impl;
class UTF8Escaper

in the following method :

public void writeCData(String text, Writer writer) throws IOException {

if the text parameter == null then the condition on the following line throws an exception

for (int i = 0; i < text.length(); i++)

In my class the text value is null.