iPhone crash possibly related to NSUserDefaults - xcode

Question

New Information: I have replicated the crash while the phone is connected to my computer with an exception breakpoint enabled, and the application is paused at the moment. If anyone wants to help me with what I should do to get the relevant information before I stop the app, that would be great. It stopped me on a line that was creating a sound which I haven't had a problem with for weeks, so that's confusing.
I recently implemented NSUserDefaults in my game, and it's been causing crashes. The problem is, it never crashes when it'c connected to my computer so I can't actualluy catch the crash - I'm only assuming it has to do with NSUserDefaults.
As of right now I've only stored Ints in my NSUserDefaults. I have realized this morning that I haven't been using the synchronize call, could this be causing the crashes?
Also, how do you check for a key that doesn't exist?
The crash occurs when I tap to switch from the game menu into actually playing the game. One of the first lines of code in the game scene's initWithSize is a call to check and NSLog some default values.
New information: After looking at the crash logs it appears that this crash has two parts. First, a KERN_PROTECTION_FAILURE which crashes the app when I'm using it, and actually another "crash" is being reported a few minutes later, at times which I am sure I am not using the app.
EDIT: CRASH LOG 1:
Hardware Model: iPhone6,1
Process: Pixel Pilot [28505]
Path: /var/mobile/Applications/0DD06667-D5BA-4FAA-A5B1-2747054A79A0/Pixel Pilot.app/Pixel Pilot
Identifier: com.pixelstewdio.Pixel-Pilot
Version: 1.0 (1.0)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2014-11-12 07:34:03.272 -0500
OS Version: iOS 7.1.2 (11D257)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000018516aefa
Triggered by Thread: 0
Thread 0 Crashed:
0 SpriteKit 0x00000001873ac364 SKCSprite::removeSubsprite(SKCSprite*) + 152
1 SpriteKit 0x00000001873a0d04 -[SKShapeNode dealloc] + 52
2 libobjc.A.dylib 0x0000000190a1d470 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 520
3 CoreFoundation 0x00000001843f9b34 _CFAutoreleasePoolPop + 24
4 UIKit 0x00000001874b6540 _wrapRunLoopWithAutoreleasePoolHandler + 72
5 CoreFoundation 0x00000001844bb854 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
6 CoreFoundation 0x00000001844b8adc __CFRunLoopDoObservers + 368
7 CoreFoundation 0x00000001844b8e68 __CFRunLoopRun + 760
8 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
9 GraphicsServices 0x000000018a0e1c08 GSEventRunModal + 164
10 UIKit 0x000000018752afc0 UIApplicationMain + 1152
11 Pixel Pilot 0x000000010009034c main (main.m:16)
12 libdyld.dylib 0x0000000190ff7a9c start + 0
Thread 1:
0 libsystem_kernel.dylib 0x00000001910d9aa8 kevent64 + 8
1 libdispatch.dylib 0x0000000190fdd998 _dispatch_mgr_thread + 48
Thread 2:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 3:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 4:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 5:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 6:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 CoreFoundation 0x00000001844bad20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x00000001844b8eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
4 CoreFoundation 0x000000018444f454 CFRunLoopRun + 108
5 CoreMotion 0x0000000184bb2538 ___lldb_unnamed_function1441$$CoreMotion + 632
6 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 7:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 AudioToolbox 0x0000000183d37040 AURemoteIO::IOThread::Run() + 108
2 AudioToolbox 0x0000000183d3a234 AURemoteIO::IOThread::Entry(void*) + 8
3 AudioToolbox 0x0000000183c6a278 CAPThread::Entry(CAPThread*) + 136
4 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
5 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
6 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 8:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 CoreFoundation 0x00000001844bad20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x00000001844b8eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
4 AudioToolbox 0x0000000183c79abc GenericRunLoopThread::Entry(void*) + 156
5 AudioToolbox 0x0000000183c6a278 CAPThread::Entry(CAPThread*) + 136
6 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x000000012cd11870 x1: 0x000000012cd116d0 x2: 0x0000000000000008 x3: 0x000000019112bcdc
x4: 0x0000000000000000 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x000000018516aee6 x9: 0x00000001915e4ec8 x10: 0x0000000000000067 x11: 0x00000000002c2a00
x12: 0x0000000000000000 x13: 0x0000000000000000 x14: 0x00000000c1fb8c17 x15: 0x0000000016ed1586
x16: 0x000000019116d42c x17: 0x00000001873a0cd0 x18: 0x0000000000000000 x19: 0x000000012cd11500
x20: 0x000000012cd11870 x21: 0x0000000193ec4380 x22: 0x0000000193ec4380 x23: 0x00000000a1a1a1a1
x24: 0x0000000193eb0098 x25: 0x000000010012c048 x26: 0xa3a3a3a3a3a3a3a3 x27: 0x000000016fda6cd0
x28: 0x0000000000000001 fp: 0x000000016fda6780 lr: 0x00000001873ac344
sp: 0x000000016fda6760 pc: 0x00000001873ac364 cpsr: 0x60000000
CRASH LOG 2:
Hardware Model: iPhone6,1
Process: Pixel Pilot [28606]
Path: /var/mobile/Applications/0DD06667-D5BA-4FAA-A5B1-2747054A79A0/Pixel Pilot.app/Pixel Pilot
Identifier: com.pixelstewdio.Pixel-Pilot
Version: 1.0 (1.0)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2014-11-12 07:43:50.305 -0500
OS Version: iOS 7.1.2 (11D257)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000001
Triggered by Thread: 0
Thread 0 Crashed:
0 libGPUSupportMercury.dylib 0x0000000189cb46f8 gpus_ReturnNotPermittedKillClient + 12
1 AGXGLDriver 0x00000001830d3248 SubmitPackets + 196
2 GLEngine 0x0000000186e3fa78 gliPresentViewES_Exec + 236
3 GLEngine 0x0000000186e3f908 gliPresentViewES + 192
4 OpenGLES 0x0000000186e4cc98 -[EAGLContext presentRenderbuffer:] + 76
5 SpriteKit 0x0000000187389fb8 -[SKView _renderContent] + 1080
6 libdispatch.dylib 0x0000000190fdbfd0 _dispatch_client_callout + 12
7 libdispatch.dylib 0x0000000190fe1c80 _dispatch_barrier_sync_f_invoke + 44
8 SpriteKit 0x0000000187389b40 -[SKView renderContent] + 96
9 SpriteKit 0x0000000187387790 __29-[SKView setUpRenderCallback]_block_invoke + 72
10 SpriteKit 0x00000001873a6a8c -[SKDisplayLink _callbackForNextFrame:] + 284
11 QuartzCore 0x0000000187100cb8 CA::Display::DisplayLinkItem::dispatch() + 32
12 QuartzCore 0x0000000187100ac4 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 296
13 IOKit 0x00000001853fbe70 IODispatchCalloutFromCFMessage + 360
14 CoreFoundation 0x00000001844aca8c __CFMachPortPerform + 188
15 CoreFoundation 0x00000001844bb03c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
16 CoreFoundation 0x00000001844baf9c __CFRunLoopDoSource1 + 440
17 CoreFoundation 0x00000001844b91c0 __CFRunLoopRun + 1616
18 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
19 GraphicsServices 0x000000018a0e1c08 GSEventRunModal + 164
20 UIKit 0x000000018752afc0 UIApplicationMain + 1152
21 Pixel Pilot 0x000000010011834c main (main.m:16)
22 libdyld.dylib 0x0000000190ff7a9c start + 0
Thread 1:
0 libsystem_kernel.dylib 0x00000001910d9aa8 kevent64 + 8
1 libdispatch.dylib 0x0000000190fdd998 _dispatch_mgr_thread + 48
Thread 2:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 3:
0 libsystem_kernel.dylib 0x00000001910f2e74 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x0000000191171548 start_wqthread + 0
Thread 4:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 CoreFoundation 0x00000001844bad20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x00000001844b8eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
4 CoreFoundation 0x000000018444f454 CFRunLoopRun + 108
5 CoreMotion 0x0000000184bb2538 ___lldb_unnamed_function1441$$CoreMotion + 632
6 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 5:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 AudioToolbox 0x0000000183d37040 AURemoteIO::IOThread::Run() + 108
2 AudioToolbox 0x0000000183d3a234 AURemoteIO::IOThread::Entry(void*) + 8
3 AudioToolbox 0x0000000183c6a278 CAPThread::Entry(CAPThread*) + 136
4 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
5 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
6 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 6:
0 libsystem_kernel.dylib 0x00000001910d9ca0 mach_msg_trap + 8
1 CoreFoundation 0x00000001844bad20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x00000001844b8eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x00000001843f9dcc CFRunLoopRunSpecific + 448
4 AudioToolbox 0x0000000183c79abc GenericRunLoopThread::Entry(void*) + 156
5 AudioToolbox 0x0000000183c6a278 CAPThread::Entry(CAPThread*) + 136
6 libsystem_pthread.dylib 0x0000000191173e18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000191173d70 _pthread_start + 136
8 libsystem_pthread.dylib 0x0000000191171550 thread_start + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x00000000e00002e2 x2: 0x000000012cd58950 x3: 0x0000000000000030
x4: 0x0000000000000333 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x0000000000000001 x9: 0x00000000deadbeef x10: 0x0000000000003fff x11: 0x000000012cd5c000
x12: 0x000000012cd58000 x13: 0x00000000a190c48e x14: 0x000000008beb8f17 x15: 0x00000000e6b617dd
x16: 0x000000019116c3fc x17: 0x0015a535773a04d9 x18: 0x0000000000000000 x19: 0x000000012f000000
x20: 0x00000000e00002e2 x21: 0x000000012f00085c x22: 0x000000010310e043 x23: 0x0000000000000001
x24: 0x000000000000a050 x25: 0x0000000000000000 x26: 0x0000000000000668 x27: 0x000000000000a6a0
x28: 0x0000000193eb0098 fp: 0x000000016fd1d890 lr: 0x0000000189cb56ac
sp: 0x000000016fd1d840 pc: 0x0000000189cb46f8 cpsr: 0x60000000

Answer 1

to check if NSUserDefault object is null do this:
NSUserDefaults *example = [NSUserDefaults standardUserDefaults];
NSObject * object = [example objectForKey:#"test"];
if(object == nil)
{
//object is nil
}
else
{
//object isn't nil
}
then you need to call the when you do something inside NSUserDefault
[example synchronize];