diff --git a/ranked_tree.js b/ranked_tree.js
index c504c90..1f436c7 100644
--- a/ranked_tree.js
+++ b/ranked_tree.js
@@ -31,7 +31,7 @@ class RankedTree {
         let edges = [];
         while (!q.isEmpty()) {
             let node = q.dequeue();
-            if (!q) {
+            if (!node) {
                 continue;
             }