diff --git a/pkg/model/approval_oa.go b/pkg/model/approval_oa.go
index e8ac4bd..46a66ca 100644
--- a/pkg/model/approval_oa.go
+++ b/pkg/model/approval_oa.go
@@ -209,7 +209,7 @@ func (oa *ApprovalOA) SaveApprovalContent(in *approval.CreateRequest, a *Approva
 }
 
 func (oa *ApprovalOA) copyOAToModel(in *approval.CreateRequest, a *Approval) (approvalOA *ApprovalOA, err error) {
-
+	approvalOA = new(ApprovalOA)
 	copier.CopyWithOption(&approvalOA, in.ApprovalOA, copier.Option{DeepCopy: true})
 	approvalOA.ApprovalID = a.ID