null reference with GetAttributeValue - IIfcPropertyBoundedValue

[dumitrugrl]

Hi,
I am trying to generate json from an IFC file and still getting this exception:

		Message	"Object reference not set to an instance of an object."	string
		SerializationStackTraceString	"   at XbimExchanger.IfcToCOBieLiteUK.XbimAttributedObject.GetAttributeValue(IIfcPropertyBoundedValue ifcPropertyBoundedValue)"	string
		StackTrace	"   at XbimExchanger.IfcToCOBieLiteUK.XbimAttributedObject.GetAttributeValue(IIfcPropertyBoundedValue ifcPropertyBoundedValue)"	string
		TargetSite	{Xbim.CobieLiteUk.AttributeValue GetAttributeValue(Xbim.Ifc4.Interfaces.IIfcPropertyBoundedValue)}	System.Reflection.MethodBase {System.Reflection.RuntimeMethodInfo}

I am guessing that it has to do with these lines in the IFC:

#100= IFCPROPERTYBOUNDEDVALUE('RentalRatesInCategoryNow',$,$,$,$);
#101= IFCPROPERTYSINGLEVALUE('VacancyRateInCategoryFuture',$,IFCPOSITIVERATIOMEASURE(0.),$);
#102= IFCPROPERTYBOUNDEDVALUE('RentalRatesInCategoryFuture',$,$,$,$);

The line that throws the exception:
exchanger.Convert();

The code I am using is the ones in the samples:

 string folder = Path.GetDirectoryName(sFilePath);
string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(sFilePath);                        

var facilities = new List<Facility>();
var exchanger = new IfcToCOBieLiteUkExchanger(model2, facilities);
facilities = exchanger.Convert();

var facilityType = facilities.FirstOrDefault();
if (facilityType == null)
   return;

facilityType.WriteJson(Path.Combine(folder, $"{fileNameWithoutExtension}.json"), true);

Is there something I am missing?

Thank you!

[dumitrugrl]

The offending ifc entry: #106=IFCPROPERTYBOUNDEDVALUE('RentalRatesInCategoryNow',$,$,$,$);
Not sure if just testing for null like in the image is enough to handle this case.