--- cacti/lib/rrd.php~	2008-10-07 19:32:18.000000000 +0300
+++ cacti/lib/rrd.php	2008-11-28 02:29:52.807698495 +0200
@@ -54,7 +54,9 @@
 
 function rrd_close($rrd_struc) {
 	/* close the rrdtool file descriptor */
-	pclose($rrd_struc["fd"]);
+	if (is_resource($rrd_struc["fd"])) {
+		pclose($rrd_struc["fd"]);
+	}
 }
 
 function rrd_get_fd(&$rrd_struc, $fd_type) {