From 381166ed87c62338a4d757b95840f4bbcf1e4406 Mon Sep 17 00:00:00 2001
From: Andrey Sobolev <haiodo@users.noreply.github.com>
Date: Mon, 6 May 2024 16:02:45 +0700
Subject: [PATCH] Qfix for lookup (#5515)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>
---
 server/middleware/src/lookup.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/server/middleware/src/lookup.ts b/server/middleware/src/lookup.ts
index 33356f40d8..de87f29eb1 100644
--- a/server/middleware/src/lookup.ts
+++ b/server/middleware/src/lookup.ts
@@ -85,9 +85,9 @@ export class LookupMiddleware extends BaseMiddleware implements Middleware {
           newResult.push(newDoc)
           for (const [k, v] of Object.entries(d.$lookup)) {
             if (!Array.isArray(v)) {
-              newDoc.$lookup[k] = mapDoc(v)
+              newDoc.$lookup[k] = v != null ? mapDoc(v) : v
             } else {
-              newDoc.$lookup[k] = v.map((it) => mapDoc(it))
+              newDoc.$lookup[k] = v.map((it) => (it != null ? mapDoc(it) : it))
             }
           }
         }