diff --git a/grafast/grafast/src/engine/OutputPlan.ts b/grafast/grafast/src/engine/OutputPlan.ts
index 7453598e4f..0ecb538ffd 100644
--- a/grafast/grafast/src/engine/OutputPlan.ts
+++ b/grafast/grafast/src/engine/OutputPlan.ts
@@ -731,7 +731,7 @@ export function getChildBucketAndIndex(
       "GrafastInternalError<83d0e3cc-7eec-4185-85b4-846540288162>: arrayIndex must be supplied iff outputPlan is an array",
     );
   }
-  if (outputPlan && childOutputPlan.layerPlan === bucket.layerPlan) {
+  if (outputPlan != null && childOutputPlan.layerPlan === bucket.layerPlan) {
     // Same layer; straightforward
     return [bucket, bucketIndex];
   }