diff --git a/expire.php b/expire.php
index 8ed2f9a7..ef5c90bd 100644
--- a/expire.php
+++ b/expire.php
@@ -48,7 +48,7 @@ foreach($boards as $board) {
 		} else {// no one ever logged in, try board creation time
 			$query = query("SELECT UNIX_TIMESTAMP(time) AS time FROM board_create WHERE uri = '$board'");
 			$crt = $query->fetchAll(PDO::FETCH_COLUMN);
-			$last_activity_date->setTimestamp($crt[0]);
+			if (!empty($crt)) $last_activity_date->setTimestamp($crt[0]);
 			$last_mod_date = false;
 		}
 	}