Crash inside Android Urban Airship library 7.1.+

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This crash reports we received several times from Crashlytics. Currently affected only devices with Android OS 5.1.1

Stacktrace:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
       at com.urbanairship.push.ChannelServiceDelegate.needsPushRegistration(ChannelServiceDelegate.java:1441)
       at com.urbanairship.BaseIntentService.onHandleIntent(BaseIntentService.java:103)
       at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:145)
       at android.os.HandlerThread.run(HandlerThread.java:61)

As soon as most of users receive push notifications without any problems I do not think that it's issue of configuration of our project. Also we started receiving this crash report onlu after updating to library version 7.1.+. So looks like it's not something what we can fix on our side. But may be you have ideas how we can avoid this crash?