An expression tree lambda may not contain a null propagating operator

[simpledeveloper]

I am getting the following error when I am write the following Linq - can somebody please suggest me to write the same without getting the error. My Linq is as follows:

            myOrphanList =
                    (
                        from v in allViolations
                        from r in allInspectionResults
                        from i in allItems
                        where
                            r.InspectionResultId == i.InspectionResultId &&
                            i.InspectionItemId == v.InspectionItemId
                        select new OrphanViolationsReport
                        {
                            ViolationId = v.ViolationId,
                            ViolationNumber = v.ViolationNumber,
                            ViolationDate = v.ViolationDate,
                            ViolationType = v.ViolationType.ViolationTypeCode,
                            ItemYear = i.ItemYear,
                            ItemMakeManufacturer = i.ItemMakeManufacturer,
                            ItemModel = i.ItemModel,
                            VIN = i.VIN,
                            PIN = i.PIN,
                            InspectionResultId = r.InspectionResultId,
                            InspectionResultNumber = r.InspectionRequestNumber,
                            DealerDmvNumber = r.DealerDmvNumber,
                            InspectedCompanyName = (from a in contacts where a.ContactId == r.InspectedCompanyDataId select a.FirstName)?.FirstOrDefault()
                        }
                    ).ToList();

At the line "InspectedCompanyName = (from a in contacts where a.ContactId == r.InspectedCompanyDataId select a.FirstName)?.FirstOrDefault()" I am getting following error - how can I get rid of it - thank you

An expression tree lambda may not contain a null propagating operator

Any help please

[Lost User]

It needs an actual value. If you Google the error message you will find a number of suggestions.

[Bohdan Stupak]

Just ditch question mark in front of FirstOrDefault.