Why in Firebase Analytics Conversion (not set) is showing on Firebase dashboard

Android code for sending data to firebase analytics:-

FirebaseAnalytics logger = FirebaseAnalytics.getInstance(activity); Bundle bundle = new Bundle(); bundle.putString("Type", type); logger.logEvent("RazorPay", bundle); 

This event is correctly recorded in Firebase Analytics but in Campaign section it have displayed as (not set) https://i.sstatic.net/X8E7i.png

I have also check log in Firebase debug view all data are correctly recorded https://i.sstatic.net/YfZ1Z.png

Does anyone understand what wrong is going here, why display (not set) value?, what exactly show instead of (not set)

Thank you in advance