--- a/documents/sitemap.xml.php
+++ b/documents/sitemap.xml.php
@@ -6,7 +6,7 @@
 echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . "\n";
 echo " <url><loc>" . local_url() . "index.php</loc><priority>1.0</priority></url>\n";
 foreach (scandir("./") as $file) {
-    if (strpos($file, ".php") !== false && $file != "index.php" && $file != "sitemap.xml.php"&& $file != "viewDocument.php")
+    if (strpos($file, ".php") !== false && ($file != "index.php" && $file != "sitemap.xml.php"&& $file != "viewDocument.php")) {
         echo " <url><loc>" . local_url() . "$file</loc><priority>0.6</priority></url>\n";
 	}
 }