diff --git a/lib/bundle.js b/lib/bundle.js
index 60646c961..37f44c379 100644
--- a/lib/bundle.js
+++ b/lib/bundle.js
@@ -177,7 +177,7 @@ function logTree(tree) {
   ui.log('info', '');
   tree = alphabetize(tree);
   for (var name in tree) {
-    if (tree[name].metadata.build !== false)
+    if (tree[name] && tree[name].metadata.build !== false)
       ui.log('info', '  `' + name + '`');
   }
   ui.log('info', '');