diff --git a/packages/core/src/lib/core/queries/output-field.ts b/packages/core/src/lib/core/queries/output-field.ts
index a86e9e6ea82..527b8be8c23 100644
--- a/packages/core/src/lib/core/queries/output-field.ts
+++ b/packages/core/src/lib/core/queries/output-field.ts
@@ -109,10 +109,11 @@ async function fetchRelatedItems (
     return toFetch.map(() => undefined)
   }
 
+  const toFetchUnique = Array.from(new Set(toFetch))
   const resolvedWhere = await accessControlledFilter(
     foreignList,
     context,
-    { [idFieldKey]: { in: toFetch } },
+    { [idFieldKey]: { in: toFetchUnique } },
     accessFilters
   )