<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function getElementsByTagName() on null in /mnt/VOL1/htdocs/xe/classes/security/htmlpurifier/library/HTMLPurifier/Lexer/DOMLex.php:68
Stack trace:
#0 /mnt/VOL1/htdocs/xe/classes/security/htmlpurifier/library/HTMLPurifier.php(178): HTMLPurifier_Lexer_DOMLex-&gt;tokenizeHTML('&lt;!DOCTYPE html ...', Object(HTMLPurifier_Config), Object(HTMLPurifier_Context))
#1 /mnt/VOL1/htdocs/xe/classes/security/Purifier.class.php(173): HTMLPurifier-&gt;purify('Mozilla/5.0 App...')
#2 /mnt/VOL1/htdocs/xe/config/func.inc.php(1100): Purifier-&gt;purify('Mozilla/5.0 App...')
#3 /mnt/VOL1/htdocs/xe/config/func.inc.php(1115): purifierHtml('Mozilla/5.0 App...')
#4 /mnt/VOL1/htdocs/xe/modules/referer/referer.controller.php(33): removeHackTag('Mozilla/5.0 App...')
#5 /mnt/VOL1/htdocs/xe/addons/referer/referer.addon.php(24): refererController-&gt;procRefererExecute()
#6 /mnt/VOL1/htdocs/xe/files/cache/addons/0pc.acivated_addons.cache.php(409): include('/mnt/VOL1/htdoc...')
#7 /mnt/VOL1/htdocs/xe/classes/module/ModuleH in <b>/mnt/VOL1/htdocs/xe/classes/security/htmlpurifier/library/HTMLPurifier/Lexer/DOMLex.php</b> on line <b>68</b><br />