--- cacti/lib/functions.php~	2008-10-05 06:16:11.000000000 +0300
+++ cacti/lib/functions.php	2008-10-05 06:16:13.069722888 +0300
@@ -437,6 +437,9 @@
 
 	if (file_exists($file_name)) {
 		$fp = fopen($file_name, "r");
+		if (!$fp) {
+			return $file_array;
+		}
 
 		/* reset back the number of bytes */
 		if ($number_of_lines > 0) {