diff --git a/packages/server/src/utilities/rowProcessor/bbReferenceProcessor.ts b/packages/server/src/utilities/rowProcessor/bbReferenceProcessor.ts
index e467a9cff3..e5edc65edd 100644
--- a/packages/server/src/utilities/rowProcessor/bbReferenceProcessor.ts
+++ b/packages/server/src/utilities/rowProcessor/bbReferenceProcessor.ts
@@ -117,12 +117,12 @@ interface UserReferenceInfo {
 export function processOutputBBReferences(
   value: string,
   type: FieldType.BB_REFERENCE_SINGLE
-): Promise<UserReferenceInfo>
+): Promise<UserReferenceInfo | undefined>
 export function processOutputBBReferences(
   value: string,
   type: FieldType.BB_REFERENCE,
   subtype: BBReferenceFieldSubType
-): Promise<UserReferenceInfo[]>
+): Promise<UserReferenceInfo[] | undefined>
 
 export async function processOutputBBReferences(
   value: string | string[],