Crash IGListKit 4.0.0 - Exception Type: NSInternalInconsistencyException the collection view's data source returned nil

[jiangxiaopeng]

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from app store crash:

Last Exception : 0 CoreFoundation 0x00000001a744e69c ___exceptionPreprocess + 164 1 libobjc.A.dylib 0x000000019f6e3c80 _objc_exception_throw + 60 2 Foundation 0x00000001a69acdd8 __userInfoForFileAndLine + 0 3 UIKitCore 0x00000001a965f578 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 2332 4 UIKitCore 0x00000001a9bdd700 -[UICollectionView _preparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 484 5 UIKitCore 0x00000001a9beceac ___114-[UICollectionView _createAndAppendViewAnimationsForInsertsInCurrentUpdate:appearingAnimations:newSubviewManager:]_block_invoke + 392 6 UIKitCore 0x00000001a9bec950 -[UICollectionView _createAndAppendViewAnimationsForInsertsInCurrentUpdate:appearingAnimations:newSubviewManager:] + 544 7 UIKitCore 0x00000001a9bebc7c -[UICollectionView _viewAnimationsForCurrentUpdateWithCollectionViewAnimator:updatingContentOffsetForRestorationAnchor:] + 516 8 UIKitCore 0x00000001a9bf1434 ___102-[UICollectionView _updateWithItems:tentativelyForReordering:propertyAnimator:collectionViewAnimator:]_block_invoke.890 + 256 9 UIKitCore 0x00000001a95cea70 +[UIView(Animation) performWithoutAnimation:] + 76 10 UIKitCore 0x00000001a985da00 -[UICollectionView _updateWithItems:tentativelyForReordering:propertyAnimator:collectionViewAnimator:] + 1800 11 UIKitCore 0x00000001a986bf3c -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:collectionViewAnimator:] + 9164 12 UIKitCore 0x00000001a9869b24 -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:animator:animationHandler:] + 420 13 zhaopin 0x000000010521f500 __67-[IGListAdapterUpdater performBatchUpdatesWithCollectionViewBlock:]_block_invoke.9(IGListAdapterUpdater.m:0) 14 zhaopin 0x000000010521ed64 -IGListAdapterUpdater performBatchUpdatesWithCollectionViewBlock: 15 zhaopin 0x0000000105220284 __60-[IGListAdapterUpdater _queueUpdateWithCollectionViewBlock:]_block_invoke(IGListAdapterUpdater.m:0) 16 libdispatch.dylib 0x00000001af3576a8 __dispatch_call_block_and_release + 32 17 libdispatch.dylib 0x00000001af359300 __dispatch_client_callout + 20 18 libdispatch.dylib 0x00000001af367998 __dispatch_main_queue_drain + 984 19 libdispatch.dylib 0x00000001af3675b0 __dispatch_main_queue_callback_4CF + 44 20 CoreFoundation 0x00000001a739901c _CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 16 21 CoreFoundation 0x00000001a7395d28 ___CFRunLoopRun + 1996 22 CoreFoundation 0x00000001a7395478 _CFRunLoopRunSpecific + 608 23 GraphicsServices 0x00000001ea9164f8 _GSEventRunModal + 164 24 UIKitCore 0x00000001a97b962c -[UIApplication _run] + 888 25 UIKitCore 0x00000001a97b8c68 _UIApplicationMain + 340 26 zhaopin 0x0000000104dd6bac main(AppDelegateProxy.swift:56) 27 ??? 0x00000001ca0cedcc 0x00000001ca0cedcc + 0

Exception Type: NSInternalInconsistencyException the collection view's data source returned nil from -collectionView:cellForItemAtIndexPath: for index path <NSIndexPath: 0xb95db915aad7c2d2> {length = 2, path = 0 - 0} Exception Codes: fault addr: 000000000000000000 Crashed Thread: 0

• [x] I have reviewed the README and documentation
• [x] I have searched existing issues and this is not a duplicate
• [x] I have attempted to reproduce the issue and include an example project.

General information

• IGListKit version: 4.0.0
• iOS version(s): all
• CocoaPods version: 1.15.2
• Xcode version: 15.4
• Devices/Simulators affected:
• Reproducible in the demo project? (Yes/No): No
• Related issues:

Debug information

# Please include debug logs using the following lldb command:
po [IGListDebugger dump]

[TimOliver]

Thanks for the report @jiangxiaopeng!

Hmm, as far as I know, the cellForItemAtIndexPath hook is more or less exposed directly in the IGSectionController class so this would seem to imply something might not be right in your code.

Do you have any more info/context we can look at here?