diff --git a/src/controllers/SalaryPeriodController.ts b/src/controllers/SalaryPeriodController.ts
index ca47924..aa870f5 100644
--- a/src/controllers/SalaryPeriodController.ts
+++ b/src/controllers/SalaryPeriodController.ts
@@ -56,8 +56,14 @@ export class SalaryPeriodController extends Controller {
     }
 
     const data = {
-      group1id: salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP1" && x.rootId == id)?.id,
-      group2id: salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP2" && x.rootId == id)?.id,
+      group1id:
+        salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP1" && x.rootId == id) == null
+          ? null
+          : salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP1" && x.rootId == id)?.id,
+      group2id:
+        salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP2" && x.rootId == id) == null
+          ? null
+          : salaryPeriod.salaryOrgs.find((x) => x.group == "GROUP2" && x.rootId == id)?.id,
       effectiveDate: salaryPeriod.effectiveDate,
       period: salaryPeriod.period,
     };