The problem appeared on iOS 6. To reproduce it you need to enter text with japanese (kana) keyboard and press on 'Lock' button when suggestions appear. After unlocking user is on application dashboard instead of the application. If press on application icon it's loaded again - app crashed when lock was pressed. It's true even for apple apps like Notes Crash logs: Application Specific Information:
![Application crash on Lock when Japanese keyboard used](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)