Element.ParameterExists node from Clockwork package not working

Hi guys,

I dont know what has happened, but this node was working yesterday, but after several restarts and reboots I still can’t get it to function properly.
I have a list of elements and I would only like the ones with a value for a parameter in my IFC-Revit Model called “IfcGUID”. Please see script below. Again it worked fine yesterday, but I did uninstall some clockwork packages and downloaded the latest, where the node also is available. However now it only gives me null values, even though the majority of my elements have a value for the parameter “IfcGUID”: