diff --git a/internal/biz/warning_budget.go b/internal/biz/warning_budget.go
index efb8283..22a3c1d 100644
--- a/internal/biz/warning_budget.go
+++ b/internal/biz/warning_budget.go
@@ -120,6 +120,9 @@ func (this *VoucherBiz) WarningBudget(ctx context.Context, product *bo.ProductBo
 	}
 
 	now := time.Now()
+	if product.StartTime == nil || product.EndTime == nil {
+		return fmt.Errorf("no start or end time")
+	}
 	if now.Before(*product.StartTime) {
 		return fmt.Errorf("not start")
 	}