Woocmmerce checkout issue

Hi,

In my checkout, unsing Woocommerce, there is the following error in between the Twon/city input field and the State/county field:

Warning: Illegal offset type in isset or empty in /home/meemeelo/public_html/wp-includes/pomo/translations.php on line 85

It shows maybe 50 times on the screen.

I think the corresponding piece of code refered to is:

* @param Translation_Entry $entry
*/
function translate_entry(&$entry) {
$key = $entry->key();
return isset($this->entries[$key])? $this->entries[$key] : false;
}

/**

Any ideas what might be wrong??