Malformed hexadecimal character escape sequence error

I had this error on Xamp, Windows 7 home premium, Firefox 23.0.1:

SyntaxError: malformed hexadecimal character escape sequence
Source script: http://localhost/html/ptcdebug/example_ptcdebug.php#
Row: 1, Column: 60
Code:
y='none'; }}}};function read_code(filename,line) {var query="http://localhostC:\xampp\htdocs\localdocs\html\ptcdebug/Ptc

I resolved this adding addslashes() to the code that gets host and the code that gets the document root (see line 1417, the _includeJs() function):

[code]
...
function read_code(filename,line)
{
var query="http://' .

addslashes($_SERVER['HTTP_HOST']) . $path=addslashes(str_replace($_SERVER['DOCUMENT_ROOT'],'',
realpath(dirname(__FILE__)))) .

'/PtcDebug.php?file="+filename;
...

Looks like the path caused troubles, since it contains the \x sequence:

http://localhostC:\xampp\htdocs\...

Very interesting issue.
I will certainly include this fix in the next realese.
Thanks for the feedback!