From the Codex (http://codex.wordpress.org/Function_Reference/get_footer)
If the theme contains no footer.php file then the footer from the default theme wp-includes/theme-compat/footer.php will be included.
Chances are that something is wrong with your footer.php, and there’s nothing to render – ie it’s being called, but it’s not doing what’s expected. .
Can you paste your footer.php?