Hi,
Thanks for posting. Unfortunately the Crashlytics screenshots don't tell us anything helpful. You will need to get Crashlytics to symbolicate their logs using the dSYM file that's installed with the SDK. You'll find it in ~/Library/SDKs/ArcGIS/iOS/Frameworks/Dynamic next to the ArcGIS.framework file.
It will also be helpful to know what the application is doing at the time.
Hope this helps.
Nick