XML_Serilaizer - Problem with PEAR::setErrorHandling

Hi, i use the function to intercept PEAR::setErrorHandling around appearing mistakes and to evaluate. This leads by the using XML_Serilaizer to problems. If i give the Serilaizer a multi one dimensional array hand over my program is broken off by a an "error" while testing, within the class XML_Serilaizer, with the function XML_Util::isValidName. Would it be better to produce on these places no error object? Is this a problem on mine or on the side of the class? Kind Regards Georg