Showing (not set) in google analytics under the Real-Time section inside Screen option for PhoneGap application

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PhoneGap

google-analytics

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I have used Google Analytic in my PhoneGap application which is working perfect but the issue is it showing (not set) under the Real-Time section inside the Screen option for Active Users tab.

This is happening with only few users from thousands.

The issue is only with the Active Users tab [Real-Time > Screen > Active Users].

From the option Screen Views (Last 30 mins) is working fine [Real-Time > Screen > Screen Views (Last 30 mins)].

I haven't linked Adwords to Google Analytics.

Refer following screen:
GA.png (77.3 KB)