one more time.. fix

includes/functions.inc.php

@@ -107,7 +107,7 @@ function searchMails() {
 	$mailboxes = Mailbox::getAllMailBoxes();
 	$lastMailOption = Option::getOptionByKey("lastMailSearch");
 	if($lastMailOption == false) {
-		$lastMailOption = 0;
+		$lastMailOption = new Option(-1, 'lastMailSearch', 0);
 	}
 	$date = date("d-M-Y", $lastMailOption->getValue());