Issue with Expense workflow while resubmission with multi-currency line

We have issue with expense workflow while resubmiting the expense.

this happens when expense sheet has mutli-currency.

email is send to submitter : "Expense Report could not be approved due to system error. Please contact your system administrator.."

Here is trace i found:

Caught Exception: First operand of . is NULL, so cannot access member baseRecord. (180,236) EX.Business.TransactionLine.OnExecute  Name:GetLine  PCPC:838  Statement:16

Statement:60

atement:42

Name:GetUsers  Statement:77

me:FindApprovers  Statement:28

                  127:    catch Exception &c1

                  128:       &ApprovalException = create EX:Approval:MISC:ApprovalException(10502, 311, "The following error occurred during submit:", &c1.ToString(), "", "", "");

                       call constructor EX:Approval:MISC:ApprovalException

                            Int=10502

                            Int=311

                            Str[43]=The following error occurred d