Just made an update to my app using Firebase 10.0.0 and seen 1 report with this stack trace:
Android
4.3.1 (rooted) / Batmobile generic XT320 (whatever that is !): java.lang.NullPointerException
at com.google.firebase.b.a.f(Unknown Source)
at com.google.firebase.b.a.e(Unknown Source)
at com.google.firebase.b.a.b(Unknown Source)
at com.google.firebase.iid.b$2.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:841)