diff --git a/packages/das/src/webhook/handlers/review.handler.ts b/packages/das/src/webhook/handlers/review.handler.ts
index 3a5f573..5ca7a83 100644
--- a/packages/das/src/webhook/handlers/review.handler.ts
+++ b/packages/das/src/webhook/handlers/review.handler.ts
@@ -20,6 +20,9 @@ export class ReviewHandler {
     // Only store submitted reviews (not pending/dismissed)
     if (payload.action !== "submitted") return;
 
+    // Mirror backfill guard: skip reviews without a reviewer id or timestamp.
+    if (!review?.user?.id || !review?.submitted_at) return;
+
     const data: Partial<Review> = {
       repoFullName,
       prNumber: payload.pull_request.number,