Clicking on a test title crash

[orta]

Xcode 6.1.1

UNCAUGHT EXCEPTION (NSInvalidArgumentException): *** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]
UserInfo: (null)
Hints: None
Backtrace:
  0  0x00007fff869fe4f4 __exceptionPreprocess (in CoreFoundation)
  1  0x000000010a8c6274 DVTFailureHintExceptionPreprocessor (in DVTFoundation)
  2  0x00007fff87d4276e objc_exception_throw (in libobjc.A.dylib)
  3  0x00007fff868a1ea8 -[__NSPlaceholderArray initWithObjects:count:] (in CoreFoundation)
  4  0x00007fff86908414 +[NSArray arrayWithObjects:count:] (in CoreFoundation)
  5  0x000000010bafd3cc -[IDEApplicationController application:openFile:] (in IDEKit)
  6  0x000000011ce7e037 -[ORPopoverController testTitleViewClicked:] at /Users/orta/Library/Application Support/Alcatraz/Plug-ins/Snapshots/SnapshotDiffs/ORPopoverController.m:131 (in Snapshots)
  7  0x00007fff87d00cd7 _os_activity_initiate (in libsystem_trace.dylib)
  8  0x00007fff9285d671 -[NSApplication sendAction:to:from:] (in AppKit)
  9  0x000000010ae2d140 __37-[DVTApplication sendAction:to:from:]_block_invoke (in DVTKit)
 10  0x000000010acf7578 -[DVTApplication sendAction:to:from:] (in DVTKit)
 11  0x00007fff92873006 -[NSControl sendAction:to:] (in AppKit)
 12  0x00007fff92872f2c __26-[NSCell _sendActionFrom:]_block_invoke (in AppKit)
 13  0x00007fff87d00cd7 _os_activity_initiate (in libsystem_trace.dylib)
 14  0x00007fff92872e89 -[NSCell _sendActionFrom:] (in AppKit)
 15  0x00007fff87d00cd7 _os_activity_initiate (in libsystem_trace.dylib)
 16  0x00007fff92871295 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] (in AppKit)
 17  0x00007fff928c9819 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] (in AppKit)
 18  0x00007fff9286fb18 -[NSControl mouseDown:] (in AppKit)
 19  0x00007fff92dc2cf0 -[NSWindow _reallySendEvent:isDelayedEvent:] (in AppKit)
 20  0x00007fff92768b14 -[NSWindow sendEvent:] (in AppKit)
 21  0x00007fff927657f1 -[NSApplication sendEvent:] (in AppKit)
 22  0x000000010b8d5ab4 -[IDEApplication sendEvent:] (in IDEKit)
 23  0x00007fff9268ee08 -[NSApplication run] (in AppKit)
 24  0x00007fff92609e64 NSApplicationMain (in AppKit)
 25  0x00007fff8ec445c9 start (in libdyld.dylib)

Performing @selector(testTitleViewClicked:) from sender NSButton 0x7fe79e8bae80

[orta]

Application Specific Information:
Sending tappedButton: to <ORSnapshotDiffs: 0x7f9abd1a8b40> from <NSButton: 0x7f9a7d8ea9a0>
ProductBuildVersion: 7C1002
UNCAUGHT EXCEPTION (NSRangeException): *** -[__NSArray0 objectAtIndex:]: index 18446744073709551615 beyond bounds for empty NSArray
UserInfo: (null)
Hints: 
  0: Sending tappedButton: to <ORSnapshotDiffs: 0x7f9abd1a8b40> from <NSButton: 0x7f9a7d8ea9a0>
Backtrace:
  0  0x00007fff9ac0faca __exceptionPreprocess (in CoreFoundation)
  1  0x00000001043cbb07 DVTFailureHintExceptionPreprocessor (in DVTFoundation)
  2  0x00007fff9860e73c objc_exception_throw (in libobjc.A.dylib)
  3  0x00007fff9aba61f5 -[__NSArray0 objectAtIndex:] (in CoreFoundation)
  4  0x000000011174579f -[ORPopoverTableDataSource objectForRow:] at /Users/orta/Library/Application Support/Alcatraz/Plug-ins/Snapshots/SnapshotDiffs/ORPopoverTableDataSource.m:90 (in Snapshots)
  5  0x000000011174301a -[ORPopoverController tableViewSelectionDidChange:] at /Users/orta/Library/Application Support/Alcatraz/Plug-ins/Snapshots/SnapshotDiffs/ORPopoverController.m:84 (in Snapshots)
  6  0x0000000111742daa -[ORPopoverController awakeFromNib] at /Users/orta/Library/Application Support/Alcatraz/Plug-ins/Snapshots/SnapshotDiffs/ORPopoverController.m:58 (in Snapshots)
  7  0x00007fff8d63ef20 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] (in AppKit)
  8  0x00007fff8d80280a -[NSNib _instantiateNibWithExternalNameTable:options:] (in AppKit)
  9  0x00007fff8d80245a -[NSNib _instantiateWithOwner:options:topLevelObjects:] (in AppKit)
 10  0x00007fff8d801953 -[NSViewController loadView] (in AppKit)
 11  0x00007fff8d788d08 -[NSViewController _loadViewIfRequired] (in AppKit)
 12  0x00007fff8d788c73 -[NSViewController view] (in AppKit)
 13  0x00007fff8d890627 -[NSPopover showRelativeToRect:ofView:preferredEdge:] (in AppKit)
 14  0x000000011174985a -[ORSnapshotDiffs tappedButton:] at /Users/orta/Library/Application Support/Alcatraz/Plug-ins/Snapshots/SnapshotDiffs/ORSnapshotDiffs.m:94 (in Snapshots)
 15  0x00007fff9812c07a _os_activity_initiate (in libsystem_trace.dylib)
 16  0x00007fff8d84c51d -[NSApplication sendAction:to:from:] (in AppKit)