php - HTMLPurifier causes pointer being freed not allocated and segmentation fault

Question

I'm using HTMLPurifier on an PHP site I'm developing and testing locally with XAMPP on Mac. The app is built using Doctrine2 + Codeigniter.

I am running HTMLPurifier on about 4 text fields on save of a model. Sometimes I receive a No Data Received error message when doing this. Checking the apache logs I see this message:

*** set a breakpoint in malloc_error_break to debug
httpd(60406) malloc: *** error for object 0x2af7070: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
httpd(60412) malloc: *** error for object 0x2ae0004: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
httpd(60412) malloc: *** error for object 0x2af7070: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
[Sun Oct 21 13:13:18 2012] [notice] child pid 60414 exit signal Segmentation fault (11)

If I turn off HTMLPurifier, no error messages are traced.

Here is the code I'm using:

// ContentMedia model
public function purifyHTMLText(){

    $CI =& get_instance();

    $this->imageCredits = $CI->applibrary->doPurify($this->imageCredits);
    $this->contentCopy = $CI->applibrary->doPurify($this->contentCopy);
    $this->extraCredits = $CI->applibrary->doPurify($this->extraCredits);
    $this->authors = $CI->applibrary->doPurify($this->authors);

}

// AppLibrary
public function getHTMLPurifier(){

    if(!isset($htmlPurifier)){

        $CI =& get_instance();
        $CI->load->library('HTMLPurifier');
        $config = \HTMLPurifier_Config::createDefault();
        $config->set('HTML.Allowed', 'a[href],br,b,strong,em');
            $config->set('HTML.DefinitionID', 'mydef');
            $config->set('HTML.DefinitionRev', 1);
            $config->set('Cache.DefinitionImpl', 'Serializer');
            $def = $config->maybeGetRawDefinition('HTML');
        $this->htmlPurifier = new \HTMLPurifier($config);

    }

}

public function doPurify($text){
            $this->getHTMLPurifier();
    return $this->htmlPurifier->purify($text);
}