** -[__NSSingleObjectArrayI objectAtIndex:]: index 18446744073709551615 beyond bounds [0 .. 0] - ios

Question

I'm trying to understand the reason behind the crash.
What is __NSSingleObjectArrayI ? I couldn't find any information on this.
The crashlog sent by crashlytics is:
Fatal Exception: NSRangeException
0 CoreFoundation 0x1836fa1c0 __exceptionPreprocess
1 libobjc.A.dylib 0x18213455c objc_exception_throw
2 CoreFoundation 0x1836eb428 +[__NSSingleObjectArrayI automaticallyNotifiesObserversForKey:]
3 boostApp 0x100070098 -[LocationPromptVc tableView:didSelectRowAtIndexPath:] (LocationPromptVc.m:269)
4 UIKit 0x189683078 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:]
5 UIKit 0x189733b34 -[UITableView _userSelectRowAtPendingSelectionIndexPath:]
6 UIKit 0x1897e6d5c _runAfterCACommitDeferredBlocks
7 UIKit 0x1897d8b10 _cleanUpAfterCAFlushAndRunDeferredBlocks
8 UIKit 0x189547854 _afterCACommitHandler
9 CoreFoundation 0x1836a77dc __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
10 CoreFoundation 0x1836a540c __CFRunLoopDoObservers
11 CoreFoundation 0x1836a589c __CFRunLoopRun
12 CoreFoundation 0x1835d4048 CFRunLoopRunSpecific
13 GraphicsServices 0x18505a198 GSEventRunModal
14 UIKit 0x1895c02fc -[UIApplication _run]
15 UIKit 0x1895bb034 UIApplicationMain
16 boostApp 0x1000bbc24 main (main.m:14)
17 libdispatch.dylib 0x1825b85b8 (Missing)
The crash is happening in the below method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//NSArray //NSArray both are strong,nonatomic
self.selectedLocation = self.filteredLocations[indexPath.row];
[self.tableView reloadData];
[self.searchField resignFirstResponder];
}
//datasource method
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.filteredLocations.count;
}
74% of crashes are happening on iOS10. I have 31 crashes in the past 90 days.
Why is the didSelectRow method pointing to wrong index 18446744073709551615 ?
This crash is very rare, and I'm not able to reproduce it. Any ideas on debugging this ?
The table view is simple.IT has a search field on nav bar, and based on searchfield text,I filter locations and populate the tableview.Once the user select any row, I show the location data on different VC.

Answer 1

Try this code.. May this code will help. In my application I am also getting the same crash for collectionView and its very rare. Its a purely indexOutOfBounds issue. I dont know how come my collectionView showing more items than datasource count. But conditional check helps me and now my app is not crashing
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//NSArray //NSArray both are strong,nonatomic
if (self.filteredLocations.count > indexPath.row && indexPath.row >= 0) {
self.selectedLocation = self.filteredLocations[indexPath.row];
[self.tableView reloadData];
[self.searchField resignFirstResponder];
}
}