diff --git a/samples/dev/index.js b/samples/dev/index.js
index 11019a2..aa2590b 100644
--- a/samples/dev/index.js
+++ b/samples/dev/index.js
@@ -376,6 +376,11 @@ function handleKeydown(event) {
     }
 
     if (action.type === 'stackArrow') {
+      if (calc.isEditing) {
+        render();
+        return;
+      }
+
       if (isMovingStackItem) {
         moveStackItem(action.value);
       } else {