请参阅来自苹果应用商店的以下崩溃，对以下问题感到困惑。
- 应用程序何时会尝试退出并在此类调用堆栈中崩溃？
- 哪些情况会以这种方式导致应用崩溃？
任何讨论或建议将不胜感激，在此先感谢。
Hardware Model: iPhone3,3
Process: ScoutFree [2276]
Path: /var/mobile/Applications/BD0A91F2-DEA3-439C-B8A0-4CB695CEF735/MyApp.app/MyApp
Identifier: ScoutFree
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2012-08-14 16:31:38.700 -0400
OS Version: iPhone OS 5.1.1 (9B206)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xff6ca1f8
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 ??? 0xff6ca1f8 0 + -9657864
1 libsystem_c.dylib 0x349534f8 exit
2 UIKit 0x31746fe6 -[UIApplication _terminateWithStatus:]
3 UIKit 0x3174389a -[UIApplication _handleApplicationSuspend:eventInfo:]
4 UIKit 0x316d3efa -[UIApplication handleEvent:withNewEvent:]
5 UIKit 0x316d3562 -[UIApplication sendEvent:]
6 UIKit 0x316d2f36 _UIApplicationHandleEvent
7 GraphicsServices 0x31347226 PurpleEventCallback
8 CoreFoundation 0x30f8551e __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
9 CoreFoundation 0x30f854c0 __CFRunLoopDoSource1
10 CoreFoundation 0x30f8430e __CFRunLoopRun + 1366
11 CoreFoundation 0x30f074a0 CFRunLoopRunSpecific
12 CoreFoundation 0x30f07368 CFRunLoopRunInMode
13 GraphicsServices 0x31346434 GSEventRunModal
14 UIKit 0x31701cd0 UIApplicationMain
15 ScoutFree 0x000739f8 -[TelenavNavigatorAppDelegate application:didFinishLaunchingWithOptions:] (TelenavNavigatorAppDelegate.m:312)
16 ScoutFree 0x00003384 0x00003384 (in MyApp)