EXC_BAD_ACCESS After XCode Validate Project Settings

[DenVog]

I have an older app that I recently opened with XCode 6.3.2. Did a build on a device running iOS 8.3 and it seemed to run fine. XCode pestered me to

Validate Project Settings / Update to recommended settings
After doing so, I see a crash when I run on a device:
AQGridViewUpdateInfo line 775 NSUInteger newIndex = _oldToNewIndexMap[oldIndex]; gets Thread 1:EXC_BAD_ACCESS (code=1, address=0xfffffffffffffff8)
Other than updating to the latest version of AQGridView, I've only made 2 changes:

1. Changed GUARD_ITEMS so you can build in debug without crashing.
   updateNewGridDataAndCreateMappingTables for 64 bit #208
2. Workaround for compiler error: too many arguments
   Fixed XCode 6 compiler error #211

[Malek-aljundi]

Did you manage to fix this error ??

[HeyZiko]

We implemented #211 and #208 and hit this problem.
During debugging, I saw that (in my case) the app hit line 190:
_oldToNewIndexMap == NULL.
On line 775 (where the failure occurs), the code is trying to access that variable (even though it's null). Classic.
To fix, I added the following to the condition in to for loop: && _oldToNewIndexMap != NULL. This seems to have solved our problems, but we don’t use the library extensively so tread carefully.

To recap, line 773 should now look like this:
for ( NSUInteger oldIndex = [movingSet firstIndex]; oldIndex != NSNotFound && _oldToNewIndexMap != NULL; oldIndex = [movingSet indexGreaterThanIndex: oldIndex] )