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在我的应用程序已经采取了一定的表视图，如果用户进行并保存更改其数据获取后台线程刷新。应用程序崩溃被刷新它
问题是 -
当用户正在采取一些编辑的 表行和它的数据被刷新的背景 ，由于 做了一些其他的用户，那么应用程序 崩溃的变化。
任何人都可以建议我为它的一些解决方案？
下面是崩溃报告的部分：
Process: RCS [153]
Path: /Applications/RCS.app/Contents/MacOS/RCS
Identifier: com.tprf.RCS
Version: 1.5.10 build-0212 (1.5.10)
Code Type: X86 (Native)
Parent Process: launchd [96]
Date/Time: 2010-10-07 11:40:15.595 -0700
OS Version: Mac OS X 10.6.4 (10F569)
Report Version: 6
Interval Since Last Report: 297915 sec
Crashes Since Last Report: 2
Per-App Interval Since Last Report: 213604 sec
Per-App Crashes Since Last Report: 1
Anonymous UUID: 4037E18D-81EF-461F-95D5-9E7D7C5701A6
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000000c0e9bb1a
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
objc_msgSend() selector name: objectForKey:
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x97a4aedb objc_msgSend + 27
1 com.apple.AppKit 0x90c558ec -[NSTableView _delegateWillDisplayCell:forColumn:row:] + 62
2 com.apple.AppKit 0x90bd29f5 -[NSTableView preparedCellAtColumn:row:] + 1362
3 com.apple.AppKit 0x90becacc -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 56
4 com.apple.AppKit 0x90bebb3a -[NSTableView drawRow:clipRect:] + 1131
5 com.apple.AppKit 0x90beb572 -[NSTableView drawRowIndexes:clipRect:] + 360
6 com.apple.AppKit 0x90be9f4b -[NSTableView drawRect:] + 1144
7 com.apple.AppKit 0x90bdfa36 -[NSView _drawRect:clip:] + 3510
8 com.apple.AppKit 0x90bde6d4 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1600
9 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
10 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
11 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
12 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
13 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
14 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
15 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
16 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
17 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
18 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
19 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
20 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
21 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
22 com.apple.AppKit 0x90bdea09 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2421
23 com.apple.AppKit 0x90bdcbf3 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 711
24 com.apple.AppKit 0x90bdc767 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 265
25 com.apple.AppKit 0x90bd90ae -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 3309
26 com.apple.AppKit 0x90b39d3f -[NSView displayIfNeeded] + 818
27 com.apple.AppKit 0x90b03050 -[NSWindow displayIfNeeded] + 204
28 com.apple.AppKit 0x90b34572 _handleWindowNeedsDisplay + 696
29 com.apple.CoreFoundation 0x996812c2 __CFRunLoopDoObservers + 1186
30 com.apple.CoreFoundation 0x9963d9bd __CFRunLoopRun + 557
31 com.apple.CoreFoundation 0x9963d094 CFRunLoopRunSpecific + 452
32 com.apple.CoreFoundation 0x9963cec1 CFRunLoopRunInMode + 97
33 com.apple.HIToolbox 0x905ecf9c RunCurrentEventLoopInMode + 392
34 com.apple.HIToolbox 0x905ecc8d ReceiveNextEventCommon + 158
35 com.apple.HIToolbox 0x905ecbd6 BlockUntilNextEventMatchingListInMode + 81
36 com.apple.AppKit 0x90b0aa89 _DPSNextEvent + 847
37 com.apple.AppKit 0x90b0a2ca -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
38 com.apple.AppKit 0x90acc55b -[NSApplication run] + 821
39 com.apple.AppKit 0x90ac45ed NSApplicationMain + 574
感谢，
Miraaj