Need help interpreting a crash log from QuincyKit - ios

Question

I recently added QuincyKit (a crash log reporter that sits on top of PLCrashReporter) into an app and I received a crash log that I'm having trouble interpreting.
The crash log seems to be inconsistent - it says it was thread 0 that crashed, but the "Last Exception Backtrace" doesn't match with the thread 0 callstack. The last exception points to a table method, but thread 0 callstack indicates an abort occurred during the Quincy manager initialization.
Moreover, the "Last Exception Backtrace" doesn't seem to make much sense taken on it's own - the "canEditRowAtIndexPath" method doesn't even include a call to "removeObjectAtIndex" at all (see below for the method).
Can anyone shed any light onto whether or not I should be paying attention to the "Last Exception Backtrace" or is that a red herring, and I should really be looking into why PLCrashReporter aborted during start up?
Many thanks
Crash log excerpt:
Exception Type: SIGABRT
Exception Codes: #0 at 0x38362df0
Crashed Thread: 0
Application Specific Information:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 7 beyond bounds [0 .. 6]'
Last Exception Backtrace:
0 CoreFoundation 0x29920fef <redacted> + 126
1 libobjc.A.dylib 0x37d0cc8b objc_exception_throw + 38
2 CoreFoundation 0x29833821 -[__NSArrayM removeObjectAtIndex:] + 0
3 DART 0x000906b3 -[DeliveryComplete tableView:canEditRowAtIndexPath:] + 262
4 UIKit 0x2d0a3c25 -[UITableView _canEditRowAtIndexPath:] + 60
5 UIKit 0x2d0a3a7f -[UITableView _setupCell:forEditing:atIndexPath:animated:updateSeparators:] + 130
6 UIKit 0x2d0a1179 <redacted> + 2320
7 UIKit 0x2cf82a31 +[UIView performWithoutAnimation:] + 72
8 UIKit 0x2d0a0861 -[UITableView _configureCellForDisplay:forIndexPath:] + 336
9 UIKit 0x2d246383 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 498
10 UIKit 0x2d24642f -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 54
11 UIKit 0x2d23b013 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2258
12 UIKit 0x2d049657 -[UITableView layoutSubviews] + 186
13 UIKit 0x2cf73023 -[UIView layoutSublayersOfLayer:] + 546
14 QuartzCore 0x2c993d99 -[CALayer layoutSublayers] + 128
15 QuartzCore 0x2c98f5cd <redacted> + 360
16 QuartzCore 0x2c98f455 <redacted> + 16
17 QuartzCore 0x2c98edf1 <redacted> + 224
18 QuartzCore 0x2c98ebdf <redacted> + 434
19 UIKit 0x2cf6b23b <redacted> + 126
20 CoreFoundation 0x298e6fed <redacted> + 20
21 CoreFoundation 0x298e46ab <redacted> + 278
22 CoreFoundation 0x298e4ab3 <redacted> + 914
23 CoreFoundation 0x29831201 CFRunLoopRunSpecific + 476
24 CoreFoundation 0x29831013 CFRunLoopRunInMode + 106
25 GraphicsServices 0x3100d201 GSEventRunModal + 136
26 UIKit 0x2cfd5a59 UIApplicationMain + 1440
27 DART 0x00015491 _mh_execute_header + 25745
28 libdyld.dylib 0x38298aaf <redacted> + 2
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x38362df0 __pthread_kill + 8
1 libsystem_c.dylib 0x382fe909 abort + 76
2 DART 0x00122dd7 -[PLCrashReporter enableCrashReporterAndReturnError:] + 1294
3 CoreFoundation 0x2992131f <redacted> + 630
4 libobjc.A.dylib 0x37d0cf13 <redacted> + 174
5 libc++abi.dylib 0x37643de3 <redacted> + 78
6 libc++abi.dylib 0x376438af __cxa_rethrow + 102
7 libobjc.A.dylib 0x37d0cdd3 objc_exception_rethrow + 42
8 CoreFoundation 0x2983129d CFRunLoopRunSpecific + 632
9 CoreFoundation 0x29831013 CFRunLoopRunInMode + 106
10 GraphicsServices 0x3100d201 GSEventRunModal + 136
11 UIKit 0x2cfd5a59 UIApplicationMain + 1440
12 DART 0x00015491 _mh_execute_header + 25745
13 libdyld.dylib 0x38298aaf <redacted> + 2
"canEditRowAtIndexPath" method:
-(BOOL) tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
if (tableView.tag == SIGNER_TABLE_TAG_VALUE)
{
RouteStopData *currentStop = [CurrentRoute singleton].selectedStop;
NSArray *signers = [currentStop signerNamesForStop];
if (indexPath.row >= [signers count])
{
return NO;
}
if ([[signers objectAtIndex:indexPath.row] isEqualToString:DARK_DROP_SIGNER_STRING] ||
[[signers objectAtIndex:indexPath.row] isEqualToString:PAPER_INVOICE_SIGNER_STRING] ||
[[signers objectAtIndex:indexPath.row] isEqualToString:ADD_NEW_SIGNER_STRING]
)
{
return NO;
}
return YES;
}
return NO;
}

Answer 1

If you are using ios7, it's maybe UIKit's fault.
Tableview would like to call delegate method before dealloc.
So you can add this code in your Custom class:
- (void )dealloc{
self.tableView.dataSource = nil;
self.tableView.delegate = nil;
}
See more in iOS 7 bug or my bug in UIAlertView