Segmentation fault (core dumped)

[GunMuse]

/usr/local/bin/php -f /home/shared/public_html/digger/admin/spider.php http://www.theproductionmonkey.com
Spidering in progress...
-----------------------------
SITE : http://www.theproductionmonkey.com/
Exclude paths :
- firebase_forums
- firebase_administration
- firebase_login

Wait...
Segmentation fault (core dumped)
root@pistol [/zend/ZendOptimizer-2.6.2-linux-glibc21-i386]# /usr/local/bin/php -f /home/shared/public_html/digger/admin/spider.php http://www.gunmuse.com
Spidering in progress...
-----------------------------
SITE : http://www.gunmuse.com/
Exclude paths :
- @NONE@

Wait...
Segmentation fault (core dumped)
root@pistol [/zend/ZendOptimizer-2.6.2-linux-glibc21-i386]# /usr/local/bin/php -f /home/shared/public_html/digger/admin/spider.php http://www.prnewsnow.com
Spidering in progress...
-----------------------------
SITE : http://www.prnewsnow.com/
Exclude paths :
- @NONE@

Wait...
Segmentation fault (core dumped)

Now why???