Did you change the appodeal plugin last week?
I received a lot of crash reports since last update (build: just change some graphics).
I have been using appodeal.beta and build 2018.3449.
java.lang.NullPointerException
com.appodeal.ads.b.e$1.run
java.lang.NullPointerException :
at com.appodeal.ads.b.e$1.run (Unknown Source:8)
at android.os.Handler.handleCallback (Handler.java:789)
at android.os.Handler.dispatchMessage (Handler.java:98)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:6696)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:240)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:782)
Because of the following?