Need help with Custome Calculations and Expression

Question

Hello, 
 I have a error when generate the report 
 "ND" if BoundItems["TargetPeak"] is None or BoundItems["TargetPeak"].IsFinalConcentrationNull() or BoundItems["TargetPeak"].CalculatedConcentration < BoundItems["TargetCompounds"].LimitOfDetection else BoundItems["TargetPeak"].FinalConcentration 
 Thanks.

howard_sanford · Answer

Hello NPNguyen , 
 Without knowing what error you are receiving, one potential issue with the above statement is that it will fail if a compound does not have a value entered for its LimitOfDetection. Is this what the error mentions?