NSInvalidArgumentException

[SafeSlingerProject]

Crashlytics #140
SafeSlinger 1.8.2 (1.8.2.2)
edu.cmu.cylab.safeslinger.app
UIKit
-[UIView(Internal) _addSubview:positioned:relativeTo:]
iPhone 4
iOS 7.1.2
Thread : Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x2f5daf83 __exceptionPreprocess + 130
1 libobjc.A.dylib 0x39d8bccf objc_exception_throw + 38
2 CoreFoundation 0x2f5daec5 -[NSException initWithCoder:]
3 UIKit 0x31e03535 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 108
4 UIKit 0x31e034bf -[UIView(Hierarchy) addSubview:] + 30
5 UIKit 0x31fcbf71 __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke + 1212
6 UIKit 0x31e09ac5 +[UIView(Animation) performWithoutAnimation:] + 72
7 UIKit 0x31fcb879 -[_UINavigationParallaxTransition animateTransition:] + 728
8 UIKit 0x31f88b27 -[UINavigationController _startCustomTransition:] + 2614
9 UIKit 0x31ea5d63 -[UINavigationController _startDeferredTransitionIfNeeded:] + 418
10 UIKit 0x31ea5b6d -[UINavigationController viewWillLayoutSubviews] + 44
11 UIKit 0x31ea5b05 -[UILayoutContainerView layoutSubviews] + 184
12 UIKit 0x31df7d59 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 380
13 QuartzCore 0x31a7562b -[CALayer layoutSublayers] + 142
14 QuartzCore 0x31a70e3b CA::Layer::layout_if_needed(CA::Transaction) + 350
15 QuartzCore 0x31a70ccd CA::Layer::layout_and_display_if_needed(CA::Transaction) + 16
16 QuartzCore 0x31a706df CA::Context::commit_transaction(CA::Transaction*) + 230
17 QuartzCore 0x31a704ef CA::Transaction::commit() + 314
18 UIKit 0x31dfb3e1 _UIApplicationHandleEventQueue + 8232
19 CoreFoundation 0x2f5a620b CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 14
20 CoreFoundation 0x2f5a56db __CFRunLoopDoSources0 + 206
21 CoreFoundation 0x2f5a3ecf __CFRunLoopRun + 622
22 CoreFoundation 0x2f50eebf CFRunLoopRunSpecific + 522
23 CoreFoundation 0x2f50eca3 CFRunLoopRunInMode + 106
24 GraphicsServices 0x34414663 GSEventRunModal + 138
25 UIKit 0x31e5b14d UIApplicationMain + 1136
26 SafeSlinger 0x0005e2b3 main (main.m:33)

[tenmalin]

Hard to debug based on the current stack dump. Move it out from 1.8.3 milestone.
Require more information to find root of cause.