We are seeing a crash when attempting to display the Japanese Kana keyboard (日本語－かな) in our iPhone-only app running on an iPad with iPadOS 27.0.1. The keyboard displays successfully in our app on iPadOS 26 and iPadOS 27.0. We also reproduced a similar crash in other iPhone-only apps downloaded from the App Store on the affected iPad. We have not yet confirmed whether those apps crash with the same exception. Our app logs the following exception:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM insertObject:atIndex:]: index 15 beyond bounds [0 .. 2]'
*** First throw call stack: ( 0x19fab7190 0x19f834380 0x19fa45734 0x1aee9f5bc 0x1aee3dc14 0x1aee3cb30 0x1aee3c4d4 0x1aee3ab0c 0x1a433798c 0x1a44a4120 0x1a449bd5c 0x1a42148c8 0x1a42143fc 0x1a4239d7c 0x1a421203c 0x1a3fc1338 0x1a3d12e0c 0x1a3d11ed0 0x1a52784ec 0x1a3d11abc 0x1a4115238 0x1a3d436d4 0x1a3d43a80 0x1a44eea14 0x1aabb8ef8 0x1a517161c 0x1a5152450 0x1a5153388 0x1a41f20c4 0x1a49e3fec 0x1a426598c 0x1a42657fc 0x1a4265580 0x1a3d62b30 0x1a3d62984 0x1a95c4dac 0x1a994fb68 0x1a95c5514 0x1a95c287c 0x1a95d2608 0x1a3d6841c 0x1a3d6a298 0x1a4263874 0x1a3d60bdc 0x1a3ce8d78 0x1a3ce7b88 0x1a3ce7928 0x2d1482bc0 0x19fa78c20 0x19fa78b94 0x19fa5a268 0x19fa59384 0x19fa5a7f4 0x249e6ff24 0x1a3d381cc 0x1a9d27404 0x1a9d20b50 0x1a9d20a10 0x109042dc4 0x109042e04 0x19f8ab5b8 )
libc++abi: terminating due to uncaught exception of type NSException
Steps to reproduce:
- Enable the Japanese – Kana keyboard in the iPad’s keyboard settings.
- Open an affected iPhone-only app on an iPad running iPadOS 27.0.1.
- Tap a text input field and attempt to display the Japanese Kana keyboard.
- The app crashes.
We suspect this may be a regression involving iPhone compatibility mode on iPad and the Japanese Kana keyboard, but we have not yet identified the failing component in a symbolicated stack trace. We have submitted a report through Feedback Assistant: FB24985530. Has anyone else encountered this behavior? Are there any known workarounds we can apply in the app while this is being investigated?