我的可可应用程序偶尔会因上述特定信息而崩溃。我确定这是由于我的应用程序中的NSTableView显示，但我无法弄清楚出了什么问题。崩溃报告如下。谁能说出发生了什么？
Application Specific Information:
objc_msgSend() selector name: countByEnumeratingWithState:objects:count:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x00007fff8847a0dd objc_msgSend + 29
1 com.apple.AppKit 0x00007fff8ae1a44a -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 6008
2 com.apple.AppKit 0x00007fff8add12be -[NSView displayIfNeeded] + 1876
3 com.apple.AppKit 0x00007fff8add0b19 -[NSWindow displayIfNeeded] + 236
4 com.apple.AppKit 0x00007fff8add0782 _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints + 936
5 com.apple.AppKit 0x00007fff8b506191 __83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke1540 + 46
6 com.apple.CoreFoundation 0x00007fff8dd32127 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
7 com.apple.CoreFoundation 0x00007fff8dd32080 __CFRunLoopDoObservers + 368
8 com.apple.CoreFoundation 0x00007fff8dd24188 __CFRunLoopRun + 872
9 com.apple.CoreFoundation 0x00007fff8dd23bd8 CFRunLoopRunSpecific + 296
10 com.apple.HIToolbox 0x00007fff950db56f RunCurrentEventLoopInMode + 235
11 com.apple.HIToolbox 0x00007fff950db2ea ReceiveNextEventCommon + 431
12 com.apple.HIToolbox 0x00007fff950db12b _BlockUntilNextEventMatchingListInModeWithFilter + 71
13 com.apple.AppKit 0x00007fff8adcd9bb _DPSNextEvent + 978
14 com.apple.AppKit 0x00007fff8adccf68 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 346
15 com.apple.AppKit 0x00007fff8adc2bf3 -[NSApplication run] + 594
16 com.apple.AppKit 0x00007fff8ad3f354 NSApplicationMain + 1832
17 libdyld.dylib 0x00007fff8980e5c9 start + 1