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-rw-r--r--deps/npm/lib/install/mutate-into-logical-tree.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/deps/npm/lib/install/mutate-into-logical-tree.js b/deps/npm/lib/install/mutate-into-logical-tree.js
index b2059da906..491f20913c 100644
--- a/deps/npm/lib/install/mutate-into-logical-tree.js
+++ b/deps/npm/lib/install/mutate-into-logical-tree.js
@@ -38,7 +38,7 @@ var mutateIntoLogicalTree = module.exports = function (tree) {
Object.keys(flat).sort().forEach(function (flatname) {
var node = flat[flatname]
- if (!node.requiredBy.length) return
+ if (!(node.requiredBy && node.requiredBy.length)) return
if (node.parent) {
// If a node is a cycle that never reaches the root of the logical