当app进入后台并弹回到前台时，我的应用程序（通过Ubertesters SDK）出现异常：
Signal 11 was raised.
Signal defenition:
Signal 11 - SIGSEGV - segmentation violation - Use of a pointer that has not been initialized or points to an object that no longer exists (ie: forgot to retain); see also TerminateExplicitListWithNil
CallStack:
(
"1 MobileControl 0x00000001000fa9f4 SignalUbertestersHandler + 200",
"2 libsystem_platform.dylib 0x000000018f4cbb0c _sigtramp + 56",
"3 UIKit 0x0000000185a90798 + 100",
"4 UIKit 0x0000000185a90798 + 100",
"5 UIKit 0x0000000185a906a0 + 208",
"6 MobileControl 0x000000010007ee44 -[LocationTracker getBatteryInfo] + 100",
"7 MobileControl 0x000000010007c974 -[LocationTracker getMyInfoUsingLocation:] + 684",
"8 MobileControl 0x000000010007df7c -[LocationTracker saveLocation] + 1012",
"9 MobileControl 0x000000010007b7d0 -[LocationTracker startServiceListener] + 1564",
"10 MobileControl 0x000000010007af8c -[LocationTracker timerTaskInterval] + 372",
"11 MobileControl 0x000000010007b124 __36-[LocationTracker timerTaskInterval]_block_invoke + 44",
"12 MobileControl 0x00000001000411b4 __62-[NSTimerTask scheduleTimerTaskInterval:timeValue:usingBlock:]_block_invoke + 960",
"13 libdispatch.dylib 0x000000018f338014 + 24",
"14 libdispatch.dylib 0x000000018f337fd4 + 16",
"15 libdispatch.dylib 0x000000018f33f2b8 + 556",
"16 libdispatch.dylib 0x000000018f33f4fc + 76",
"17 libsystem_pthread.dylib 0x000000018f4cd6bc _pthread_wqthread + 356"
)
(null)
我正在尝试重新创建异常并且无法弄清楚如何。
据我所知，这些函数中的以下变量之一已不复存在，但我怎样才能找到它并处理它？</ p>