Stricter check

include/functions_entries.inc.php

@@ -1508,9 +1508,11 @@ function serendipity_printArchives() {
     $entries =& serendipity_db_query($q, false, 'assoc');
 
     $group = array();
+    if (is_array($entries)) {
         foreach($entries AS $entry) {
             $group[date('Ym', $entry['timestamp'])]++;
         }
+    }
 
     $output = array();
     for ($y = $thisYear; $y >= $lastYear; $y--) {