Bug in mysql database library

[eluser]Unknown[/eluser]
The function escape_str has a bug on quote string.
After I added following code,It's ok.

Code:

if (get_magic_quotes_gpc())
{
    return $str;
}

[eluser]Derek Jones[/eluser]
What is the source of the query? CI nullifies magic quotes in Input, and your own strings will of course not be affected.