Call to undefined function page_title_page_get_title()

After install, creating a new site in "sites" folder will generate the " page_title_page_get_title()" error, the front page is unavailable to setup.
I think the error is cused by the fact that the module is not enabled (yet), so the function is not available.
My dirty fix was to put

if (function_exists('print page_title_page_get_title()')) { print page_title_page_get_title();}else {print $head_title;}

in the tpl.php theme file.
I did not tried if the bug appear in the "template.php" instalation.

I am not a php programmer, so probably this fix is not the best option, I hope you'll find a better one.