Crash on 'Lean More' Click - ImaAdsLoader

[alonaviram]

I don't have an exact scenario, and it's pretty rare, couldn't reproduce on the demo app.
It's not specific for an ad tag or url.
I guess it's more relevant to old devices - happened to me on - LG G3 4.42
The Exception occurs probably on first install of the app and when the ad is loaded press the 'Learn More' button couple times fast.

this is the stack trace :

E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.my.app, PID: 5261
        java.lang.IllegalStateException
        at com.google.android.exoplayer2.util.Assertions.checkState(Assertions.java:79)
        at com.google.android.exoplayer2.ext.ima.ImaAdsLoader.updateImaStateForPlayerState(ImaAdsLoader.java:659)
        at com.google.android.exoplayer2.ext.ima.ImaAdsLoader.onPositionDiscontinuity(ImaAdsLoader.java:620)
        at com.google.android.exoplayer2.ExoPlayerImpl.handleEvent(ExoPlayerImpl.java:457)
        at com.google.android.exoplayer2.ExoPlayerImpl$1.handleMessage(ExoPlayerImpl.java:103)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5118)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
        at dalvik.system.NativeStart.main(Native Method)