diff --git a/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.spec.ts b/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.spec.ts
index 4088886..677f73b 100644
--- a/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.spec.ts
+++ b/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.spec.ts
@@ -65,6 +65,17 @@ describe('loadLots', () => {
     });
   });
 
+  it('leaves out a lot whose medicine vanished between the two reads', async () => {
+    const { db } = fakeDb(
+      [lotRow({ id: 'l1' }), lotRow({ id: 'gone', medicine: null })],
+      [],
+    );
+
+    const { lots } = await loadLots(db);
+
+    expect(lots.map((lot) => lot.id)).toEqual(['l1']);
+  });
+
   it('reads only active medicines', async () => {
     const { db } = fakeDb(
       [],
diff --git a/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.ts b/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.ts
index 659386f..844d708 100644
--- a/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.ts
+++ b/ApiCore-Backend/src/compliance/readiness/loaders/lots.loader.ts
@@ -57,12 +57,16 @@ export async function loadLots(db: DbClient): Promise<ReadinessLots> {
       orderBy: [{ name: 'asc' }, { id: 'asc' }],
     }),
   ]);
+  // Prisma reads the medicine in a second query: a lot deleted together with
+  // its medicine in between comes back with medicine null (CI run 836, 500).
+  // Such a lot is gone, so it is left out.
+  const present = rows.filter((row) => (row.medicine as unknown) !== null);
   const totals = await lotTotals(
     db,
-    rows.map((row) => row.id),
+    present.map((row) => row.id),
   );
   return {
-    lots: rows.map((row): ReadinessLot => ({
+    lots: present.map((row): ReadinessLot => ({
       id: row.id,
       medicineId: row.medicineId,
       medicineName: row.medicine.name,