How do I debug this crash in UIDictationController? - ios

Question

Recently I am trying to debug with the information provided by Crash Reports. So far I have been able to identify and fix some bugs but not this one.
As I read from the crash report, it's something wrong with UIDictationController, but my code did not call UIDictationController at all. The crash report is generated by PLCrashReporter.
It seems that the user is using an iPad Mini (WiFi) and running iOS 6.0.2.
Incident Identifier: [REMOVED]
CrashReporter Key: [REMOVED]
Hardware Model: iPad2,5
Process: MyApp [2849]
Path: [REMOVED]
Identifier: com.yourcompany.MyApp
Version: 1.1
Code Type: ARM
Parent Process: launchd [1]
Date/Time: 2013-01-26 02:11:01 +0000
OS Version: iPhone OS 6.0.2 (10A550)
Report Version: 104
Exception Type: SIGABRT
Exception Codes: #0 at 0x32255350
Crashed Thread: 0
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
Last Exception Backtrace:
0 CoreFoundation 0x3882e2a3 __exceptionPreprocess + 163
1 libobjc.A.dylib 0x30d8897f objc_exception_throw + 31
2 CoreFoundation 0x387788d9 -[__NSArrayM insertObject:atIndex:] + 769
3 UIKit 0x36ad24c3 -[UIDictationMeterView initWithFrame:] + 267
4 UIKit 0x36abe699 -[UIDictationView initWithFrame:] + 281
5 UIKit 0x36abdcd1 +[UIDictationView sharedInstance] + 145
6 UIKit 0x36aae7f5 -[UIDictationController setState:] + 149
7 UIKit 0x36aaef5f -[UIDictationController setupForDictationStart] + 199
8 UIKit 0x36aae5d7 -[UIDictationController startConnectionForReason:] + 51
9 UIKit 0x36aaf173 -[UIDictationController startDictationFromLayout] + 55
10 UIKit 0x36825c09 -[UIKeyboardLayoutStar touchUp:] + 5249
11 UIKit 0x3682472f -[UIKeyboardLayout touchesEnded:withEvent:] + 387
12 UIKit 0x3670c5f1 -[UIWindow _sendTouchesForEvent:] + 525
13 UIKit 0x366f9801 -[UIApplication sendEvent:] + 381
14 UIKit 0x366f911b _UIApplicationHandleEvent + 6155
15 GraphicsServices 0x3771e5a3 _PurpleEventCallback + 591
16 GraphicsServices 0x3771e1d3 PurpleEventCallback + 35
17 CoreFoundation 0x38803173 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 35
18 CoreFoundation 0x38803117 __CFRunLoopDoSource1 + 139
19 CoreFoundation 0x38801f99 __CFRunLoopRun + 1385
20 CoreFoundation 0x38774ebd CFRunLoopRunSpecific + 357
21 CoreFoundation 0x38774d49 CFRunLoopRunInMode + 105
22 GraphicsServices 0x3771d2eb GSEventRunModal + 75
23 UIKit 0x3674d2f9 UIApplicationMain + 1121
24 MyApp 0x000032e1 main (main.m:36)
25 MyApp 0x00003230 start + 40
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x30f10350 __pthread_kill + 8
1 libsystem_c.dylib 0x304f8973 abort + 95
2 MyApp 0x000e954f uncaught_exception_handler + 27
3 CoreFoundation 0x3882e57f __handleUncaughtException + 615
4 libobjc.A.dylib 0x30d88a65 _objc_terminate() + 129
5 libc++abi.dylib 0x3719807b safe_handler_caller(void (*)()) + 79
6 libc++abi.dylib 0x37198114 std::terminate() + 20
7 libc++abi.dylib 0x37199599 __cxa_current_exception_type + 1
8 libobjc.A.dylib 0x30d889d1 objc_exception_rethrow + 13
9 CoreFoundation 0x38774f21 CFRunLoopRunSpecific + 457
10 CoreFoundation 0x38774d49 CFRunLoopRunInMode + 105
11 GraphicsServices 0x3771d2eb GSEventRunModal + 75
12 UIKit 0x3674d2f9 UIApplicationMain + 1121
13 MyApp 0x000032e1 main (main.m:36)
Is there any way that I can do with this bug? Or, at least mitigating the issue? Thanks in advance.

Answer 1

the problem is that somewhere in your app you have a keyboard come up and with iOS version 6.0.1 and 6.0.2, apple enabled the dictation controller even if you didn't specify it to be enabled. Two solutions to fixing it: create a custom keyboard without it or implement dictation in your app.
My suggestion is to just let it be, only affects two outdate iOS versions and hopefully the crashes will go away as the users upgrade their devices

Answer 2

I have the keyboard coming up for a custom TextView, and when the user pushed the dictation button, said something, pushed finish, and then they tried to dismiss the keyboard, there would be a crash. Possible this is also what you're experiencing?