SIGSEGV Crash in thread 1, very small stack trace - ios

Question

Recently our released app have crashed several times with a stack trace that contain very little information to what the root cause can be. According to the crash log, the crash happens in thread 1, but this thread only have two calls. Could it be that the real problem is still in the main thread 0?
Could anyone suggest the best approach to find the background problem?
Hardware Model: iPhone6,2
Process: App [159]
Version: 0813 (1.3.2)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2014-08-16 16:51:48.114 +0200
OS Version: iOS 7.1.2 (11D257)
Report Version: 104
Exception Type: EXC_CRASH (SIGSEGV)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 1
Thread 0:
0 libobjc.A.dylib 0x00000001924901d0 objc_msgSend + 16
1 UIKit 0x0000000189026d94 -[UITableView _updateVisibleCellsNow:] + 1748
2 UIKit 0x0000000189026610 -[UITableView layoutSubviews] + 164
3 UIKit 0x0000000188f3afdc -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 344
4 QuartzCore 0x0000000188b2c254 -[CALayer layoutSublayers] + 180
5 QuartzCore 0x0000000188b26e1c CA::Layer::layout_if_needed(CA::Transaction*) + 296
6 QuartzCore 0x0000000188b26cd4 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 28
7 QuartzCore 0x0000000188b2655c CA::Context::commit_transaction(CA::Transaction*) + 276
8 QuartzCore 0x0000000188b26300 CA::Transaction::commit() + 420
9 QuartzCore 0x0000000188b1fc34 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 76
10 CoreFoundation 0x0000000185f37854 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
11 CoreFoundation 0x0000000185f34adc __CFRunLoopDoObservers + 368
12 CoreFoundation 0x0000000185e75df4 CFRunLoopRunSpecific + 488
13 GraphicsServices 0x000000018bb5dc08 GSEventRunModal + 164
14 UIKit 0x0000000188fa6fc0 UIApplicationMain + 1152
15 App 0x00000001000c8808 main (main.m:16)
16 libdyld.dylib 0x0000000192a73a9c start + 0
Thread 1 Crashed:
0 libsystem_kernel.dylib 0x0000000192b55aa8 kevent64 + 8
1 libdispatch.dylib 0x0000000192a59998 _dispatch_mgr_thread + 48
Thread 2 name: com.apple.NSURLConnectionLoader
Thread 2:
0 libsystem_kernel.dylib 0x0000000192b55ca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185f36d20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185f34eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000185e75dcc CFRunLoopRunSpecific + 448
4 Foundation 0x0000000186a6a424 +[NSURLConnection(Loader) _resourceLoadLoop:] + 344
5 Foundation 0x0000000186af8408 __NSThread__main__ + 996
6 libsystem_pthread.dylib 0x0000000192befe18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000192befd70 _pthread_start + 13