[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[2]

[philosopherdog]

I'm getting a crash on accessing any plist from the Library folder on the simulator only. What's the issue here? I am able to access plists using other mechanisms such as po or Sim Genie. It's crashing on _FileInfo.m line 140 - (BOOL)isCanPreviewInQuickLook { return [QLPreviewController canPreviewItem:self.URL]; }

self is nil.

0 CoreFoundation 0x00000001112d8ba4 __exceptionPreprocess + 242
1 libobjc.A.dylib 0x0000000112cccbe7 objc_exception_throw + 48
2 CoreFoundation 0x0000000111358f64 _CFThrowFormattedException + 194
3 CoreFoundation 0x0000000111363434 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:].cold.5 + 0
4 CoreFoundation 0x0000000111346938 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 243
5 CoreFoundation 0x00000001112d782b +[NSDictionary dictionaryWithObjects:forKeys:count:] + 49
6 QuickLook 0x0000000132a462b7 __49+[QLItem(PreviewInfo) contentTypesToPreviewTypes]_block_invoke + 429
7 libdispatch.dylib 0x0000000116a25a2c _dispatch_client_callout + 8
8 libdispatch.dylib 0x0000000116a26f10 _dispatch_once_callout + 66
9 QuickLook 0x0000000132a46108 +[QLItem(PreviewInfo) contentTypesToPreviewTypes] + 46
10 QuickLook 0x0000000132a46a1c -[QLItem(PreviewInfo) _uncachedPreviewItemTypeForContentType:] + 117
11 QuickLook 0x0000000132a46f35 -[QLItem(PreviewInfo) _previewItemTypeForType:] + 150
12 QuickLook 0x0000000132a46d3b -[QLItem(PreviewInfo) _getPreviewItemType] + 61
13 QuickLook 0x0000000132acd6d0 -[QLItem previewItemType] + 59
14 QuickLook 0x0000000132acd225 -[QLItem canBePreviewed] + 17
15 QuickLook 0x0000000132a30a47 +[QLPreviewController canPreviewItem:] + 55
16 CocoaDebug 0x000000011046d810 -[_FileInfo isCanPreviewInQuickLook] + 68
17 CocoaDebug 0x00000001104683bb -[_DirectoryContentsTableViewController viewControllerWithFileInfo:] + 194
18 CocoaDebug 0x000000011046bb50 -[_DirectoryContentsTableViewController tableView:didSelectRowAtIndexPath:] + 314
19 UIKitCore 0x000000012b1f39a1 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:isCellMultiSelect:deselectPrevious:] + 1854
20 UIKitCore 0x000000012b1f3248 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 94
21 UIKitCore 0x000000012b1f3c64 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 334