diff --git a/src/pages/05_quotation/QuotationForm.vue b/src/pages/05_quotation/QuotationForm.vue
index 6740f0ad..1223a27c 100644
--- a/src/pages/05_quotation/QuotationForm.vue
+++ b/src/pages/05_quotation/QuotationForm.vue
@@ -296,7 +296,9 @@ const productService = computed(() => {
 
 function isIssueInvoice() {
   return quotationFormData.value.paySplit.some(
-    (v) => selectedInstallmentNo.value.includes(v.no) && !!v.invoiceId,
+    (value) =>
+      selectedInstallmentNo.value.includes(value.no) &&
+      value.invoiceId !== undefined,
   );
 }
 
diff --git a/src/pages/05_quotation/form.ts b/src/pages/05_quotation/form.ts
index ef81a395..3a51506c 100644
--- a/src/pages/05_quotation/form.ts
+++ b/src/pages/05_quotation/form.ts
@@ -136,7 +136,7 @@ export const useQuotationForm = defineStore('form-quotation', () => {
       payBillDate: data.payBillDate ? new Date(data.payBillDate) : undefined,
       paySplit: data.paySplit.map((p) => ({
         no: p.no,
-        invoiceId: p.invoiceId,
+        invoiceId: p.invoiceId || undefined,
         name: p.name,
         amount: p.amount,
       })),