diff --git a/rebuild.php b/rebuild.php
index c391e65..b238c31 100644
--- a/rebuild.php
+++ b/rebuild.php
@@ -359,6 +359,7 @@ function listprojects() {
 	$projects = array();
 	foreach($ls as $dirname) {
 		if ($dirname[0] == '.') continue;
+		if (! is_dir(BASEDIR.'data/'.$dirname)) continue;
 		$matches = array();
 
 		if (preg_match('~(?:\d+-)?(.+)~', $dirname, $matches)) {