diff --git a/index.js b/index.js
index f398b8d..568596d 100644
--- a/index.js
+++ b/index.js
@@ -247,7 +247,7 @@ export default class Flatbush {
                 }
             }
 
-            nodeIndex = q.pop() >> 1;
+            nodeIndex = q.length ? q.pop() >> 1 : undefined;
         }
 
         q.clear();
diff --git a/test.js b/test.js
index 771ad29..a626691 100644
--- a/test.js
+++ b/test.js
@@ -155,6 +155,12 @@ test('k-nearest-neighbors query accepts filterFn', () => {
     assert.deepEqual(ids.sort(compare), [6, 16, 18, 24, 54, 80].sort(compare));
 });
 
+test('performs a k-nearest-neighbors query with all items', () => {
+    const index = createIndex();
+    const ids = index.neighbors(50, 50);
+    assert.deepEqual(ids.length, data.length >> 2);
+});
+
 test('returns index of newly-added rectangle', () => {
     const count = 5;
     const index = new Flatbush(count);