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Unexpected crash in BaseDexClassLoader

This crash occurred with 1800 users of our application with 1.2 monthly active users (according to the Google Developer Console). Pretty rare, but it does.

Android 4.1 to 6, but no Android 7 in reports.

What might be the nature of this ClassNotFoundException in BaseDexClassLoader. Can we avoid this?

java.lang.RuntimeException: in android.app.LoadedApk.makeApplication (LoadedApk.java//72) in android.app.ActivityThread.handleBindApplication (ActivityThread.java:4831) on android.app.ActivityThread.access $ 1500 (ActivityThread.java: 178)
in android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1531)
on android.os.Handler.dispatchMessage (Handler.java:111) in android.os.Looper.loop (Looper.java:194) at android.app.ActivityThread.main (ActivityThread.java:5637) in java.lang.reflect.Method.invoke (Method.javamail) in java.lang.reflect.Method.invoke (Method.javahaps72) in com .android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:959) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:754)

Called: java.lang.ClassNotFoundException: at dalvik.system.BaseDexClassLoader.findClass (BaseDexClassLoader.java:56) in java.lang.ClassLoader.loadClass (ClassLoader.javahaps11) in java.lang.ClassLoader.loadClass (ClassLoLoader.loadClass : 469) at android.app.Instrumentation.newApplication (Instrumentation.java:985)
at android.app.LoadedApk.makeApplication (LoadedApk.java∗67)

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