This is to track the regression introduced in master, which needs fixing for 0.14. See #9240, #9371, etc.
{
                        nChangePosInOut = -1;
                        nFeeRet += nChange;
                        reservekey.ReturnKey();
                    }
                    else
                    {
                        if (nChangePosInOut == -1)
                        {
                            
                            nChangePosInOut = GetRandInt(txNew.vout.size()+1);
                        }
                        else if ((unsigned int)nChangePosInOut > txNew.vout.size())
                        {
                            strFailReason = _("Change index out of range");
                            return false;
                        }
                        vector<CTxOut>::iterator position = txNew.vout.begin()+nChangePosInOut;
                        txNew.vout.insert(position, newTxOut);
                    }
                }
                else
                    reservekey.ReturnKey();