Ticket #3160: patch.diff

wp/wp-includes/cron.php

@@ -102 +102 @@
                 return;
 
         $keys = array_keys( $crons );
-        if ( $keys[0] > time() )
+        if ( isset($keys[0]) && $keys[0] > time() )
                 return;
 
         $schedules = wp_get_schedules();