ThreeTen Backport v1.6.8 was discovered to contain a NullPointerException via the component org.threeten.bp.LocalDate::compareTo(ChronoLocalDate). http://threeten.com https://gist.github.com/LLM4IG/3cc9183dcd887020368a0bafeafec5e3 https://github.com/ThreeTen/threetenbp