diff --git a/apps/api/src/controllers/v1/types.ts b/apps/api/src/controllers/v1/types.ts
index 6b2db308..c44c1cc5 100644
--- a/apps/api/src/controllers/v1/types.ts
+++ b/apps/api/src/controllers/v1/types.ts
@@ -348,7 +348,7 @@ export function legacyExtractorOptions(x: ExtractOptions): ExtractorOptions {
 }
 
 export function legacyDocumentConverter(doc: any): Document {
-  if (doc === null || doc === undefined) return doc;
+  if (doc === null || doc === undefined) return null;
 
   if (doc.metadata) {
     if (doc.metadata.screenshot) {