iOS7 crashing - [__NSPlaceholderDictionary initWithObjects

iOS7 crashing - [__NSPlaceholderDictionary initWithObjects

Going through my iOS6 app and trying to fix everything for iOS7.
Throughout my app I'm getting the error:
-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to
insert nil object from objects[0]
Here is the stack trace form this code:
NSString *shareString = [NSString stringWithFormat:@"I ... %@",
self.booking.venue.name];
NSArray *activityItems = [NSArray arrayWithObjects:shareString, nil];
UIActivityViewController *activityViewController =
[[UIActivityViewController alloc] initWithActivityItems:activityItems
applicationActivities:nil];
[self presentViewController:activityViewController animated:YES
completion:nil];
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary
initWithObjects:forKeys:count:]: attempt to insert nil object from
objects[0]'
*** First throw call stack:
(
0 CoreFoundation 0x03bc45e4 __exceptionPreprocess +
180
1 libobjc.A.dylib 0x032d38b6 objc_exception_throw + 44
2 CoreFoundation 0x03b8a536
-[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 390
3 CoreFoundation 0x03bb8029 +[NSDictionary
dictionaryWithObjects:forKeys:count:] + 73
4 UIKit 0x0141eea4 -[UIButton
_intrinsicSizeWithinSize:] + 1255
5 UIKit 0x017ee81d
-[UIView(UIConstraintBasedLayout) intrinsicContentSize] + 51
6 UIKit 0x017eeebf
-[UIView(UIConstraintBasedLayout) _generateContentSizeConstraints] + 36
7 UIKit 0x017eeb50
-[UIView(UIConstraintBasedLayout) _updateContentSizeConstraints] + 511
8 UIKit 0x017f4e8f
-[UIView(AdditionalLayoutSupport) updateConstraints] + 110
9 UIKit 0x0141dab7 -[UIButton
updateConstraints] + 54
10 UIKit 0x017f4728
-[UIView(AdditionalLayoutSupport)
_internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] +
239
11 UIKit 0x017f48a6
-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
12 UIKit 0x017f4827 __UIViewRecursionHelper
+ 40
13 CoreFoundation 0x03b65dc9 CFArrayApplyFunction + 57
14 UIKit 0x017f46cc
-[UIView(AdditionalLayoutSupport)
_internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] +
147
15 UIKit 0x017f48a6
-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
16 UIKit 0x017f4827 __UIViewRecursionHelper
+ 40
17 CoreFoundation 0x03b65dc9 CFArrayApplyFunction + 57
18 UIKit 0x017f46cc
-[UIView(AdditionalLayoutSupport)
_internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] +
147
19 UIKit 0x017f48a6
-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
20 UIKit 0x017f4827 __UIViewRecursionHelper
+ 40
21 CoreFoundation 0x03b65dc9 CFArrayApplyFunction + 57
22 UIKit 0x017f46cc
-[UIView(AdditionalLayoutSupport)
_internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] +
147
23 UIKit 0x017f48a6
-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
24 UIKit 0x017f4827 __UIViewRecursionHelper
+ 40
25 CoreFoundation 0x03b65dc9 CFArrayApplyFunction + 57
26 UIKit 0x017f46cc
-[UIView(AdditionalLayoutSupport)
_internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] +
147
27 UIKit 0x017f48a6
-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
28 UIKit 0x017e8f48
__62-[UIWindow(UIConstraintBasedLayout)
updateConstraintsIfNeeded]_block_invoke + 43
29 Foundation 0x02e7a3ec -[NSISEngine
withBehaviors:performModifications:] + 107
30 Foundation 0x02d0a145 -[NSISEngine
withAutomaticOptimizationDisabled:] + 48
31 UIKit 0x017e8c60
-[UIWindow(UIConstraintBasedLayout) updateConstraintsIfNeeded] + 225
32 UIKit 0x017f4f06
-[UIView(AdditionalLayoutSupport) _updateConstraintsAtWindowLevelIfNeeded]
+ 85
33 UIKit 0x011ed6ef -[UIView(Hierarchy)
layoutBelowIfNeeded] + 348
34 UIKit 0x018a3def
-[_UIBackdropContentView backdropView:recursivelyUpdateMaskViewsForView:]
+ 56
35 UIKit 0x018a4240
-[_UIBackdropContentView didMoveToWindow] + 273
36 UIKit 0x011f5be7 -[UIView(Internal)
_didMoveFromWindow:toWindow:] + 1689
37 UIKit 0x011f5847 -[UIView(Internal)
_didMoveFromWindow:toWindow:] + 761
38 UIKit 0x011f5847 -[UIView(Internal)
_didMoveFromWindow:toWindow:] + 761
39 UIKit 0x011f5847 -[UIView(Internal)
_didMoveFromWindow:toWindow:] + 761
40 UIKit 0x011f5847 -[UIView(Internal)
_didMoveFromWindow:toWindow:] + 761
41 UIKit 0x011ed070 __45-[UIView(Hierarchy)
_postMovedFromSuperview:]_block_invoke + 162
42 UIKit 0x011ecef8 -[UIView(Hierarchy)
_postMovedFromSuperview:] + 260
43 UIKit 0x011f8031 -[UIView(Internal)
_addSubview:positioned:relativeTo:] + 1847
44 UIKit 0x011eb521 -[UIView(Hierarchy)
addSubview:] + 56
45 UIKit 0x012861f8 -[UITransitionView
transition:fromView:toView:removeFromView:] + 1205
46 UIKit 0x018add65
-[UIViewControllerBuiltinTransitionViewAnimator animateTransition:] + 463
47 UIKit 0x0153a37d
__101-[UIWindowController
transition:fromViewController:toViewController:target:didEndSelector:animation:]_block_invoke_2
+ 1577
48 UIKit 0x011acd33
___afterCACommitHandler_block_invoke + 15
49 UIKit 0x011accde
_applyBlockToCFArrayCopiedToStack + 403
50 UIKit 0x011acb0a _afterCACommitHandler +
532
51 CoreFoundation 0x03b8c53e
__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
52 CoreFoundation 0x03b8c48f __CFRunLoopDoObservers
+ 399
53 CoreFoundation 0x03b6a3b4 __CFRunLoopRun + 1076
54 CoreFoundation 0x03b69b33 CFRunLoopRunSpecific + 467
55 CoreFoundation 0x03b6994b CFRunLoopRunInMode + 123
56 GraphicsServices 0x04fbb9d7 GSEventRunModal + 192
57 GraphicsServices 0x04fbb7fe GSEventRun + 104
58 UIKit 0x0119094b UIApplicationMain + 1225
59 BottlesTonight 0x000030ad main + 141
60 libdyld.dylib 0x037b8725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException
This code still works perfectly on iOS6, and I don't see anything wrong
with it. It occurs when clicking a UIButton, this also occurs when
clicking Card.io to allow users to enter card information. Prior to
building my app on iOS7 but running the iOS6 app on iOS7 betas I still
recieved this error but in more places. Now that I built it for iOS7 a few
of the places cleared up themselves but these ones still remain. Any help
would be greatly appreciated, this is all that remains prior to submitting
for iOS7.