SecurityException (@Parcel:readException:1327) {AdWorker #1}

From my research, this bug seems to be introduced when admob was integrated into Google Play service. You would see this exception when you use r15, r16 of Google Play services.

Currently, there's no solution. But the Google Team is aimming to fix this in r17.

More information here https://groups.google.com/forum/#!topic/google-admob-ads-sdk/sePctoDJbRg%5B101-125-false%5D