diff --git a/ui/src/views/form/useLookupDataSource.ts b/ui/src/views/form/useLookupDataSource.ts
index 67511172..e2f11502 100644
--- a/ui/src/views/form/useLookupDataSource.ts
+++ b/ui/src/views/form/useLookupDataSource.ts
@@ -120,7 +120,7 @@ export const useLookupDataSource = ({
         } else {
           const data = options?.data ?? options
           for (const cascadeParentField of lookupDto.cascadeParentFields.split(',')) {
-            filters.push(data[cascadeParentField])
+            filters.push(data?.[cascadeParentField] ?? null)
           }
         }
       }