iOS RCTAssert crash when unmounting near cursor pointer hover effect #55489
Description
Description
iOS app crashing in certain scenarios when unmounting view near hover effects caused by using cursor: 'pointer'.
Requires hover to be enabled, for example with an Apple Pencil Pro or "Send Pointer to Device" active in the simulator.
Reproducible test (Also in supplied reproducer)
function Playground() {
const [visible, setVisible] = React.useState(true);
return (
<View style={styles.container}>
<Pressable style={styles.button} onPress={() => setVisible(v => !v)}>
<Text>Click Me</Text>
</Pressable>
{visible && <Text>Hello World</Text>}
</View>
);
}
const styles = StyleSheet.create({
container: {
padding: 10,
},
button: {
cursor: 'pointer',
backgroundColor: 'salmon',
width: 200,
},
});A peek in the debugger reveals that self.currentContainerView.subviews has a _UIPointerEffectPlatterView in the expected index location instead of the view in question.
Also reproducible on 0.79, 0.81 and in the latest main branch.
As a side note, I've also seen these pointer hover effects being applied to views even when cursor: 'pointer' is not set, which can cause the same typeof assertion crash. But have not been able to reproduce this in a stable way. Hopefully it's the same root cause.
Steps to reproduce
- Hover the Click Me button with hover enabled (e.g. Apple Pencil Pro or "Send Pointer to Device" in simulator)
- Click the button.
- Crash
React Native Version
0.81.6
Affected Platforms
Runtime - iOS
Output of npx @react-native-community/cli info
System:
OS: macOS 14.5
CPU: (8) arm64 Apple M1
Memory: 120.50 MB / 16.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 22.15.0
path: /usr/local/bin/node
Yarn:
version: 1.22.22
path: /usr/local/bin/yarn
npm:
version: 10.9.2
path: /usr/local/bin/npm
Watchman:
version: 2026.01.12.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods:
version: 1.13.0
path: /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.2
- iOS 18.2
- macOS 15.2
- tvOS 18.2
- visionOS 2.2
- watchOS 11.2
Android SDK:
API Levels:
- "29"
- "31"
- "33"
- "34"
- "35"
Build Tools:
- 29.0.3
- 30.0.3
- 31.0.0
- 33.0.0
- 35.0.0
System Images:
- android-29 | Google APIs ARM 64 v8a
- android-31 | Google APIs ARM 64 v8a
- android-33 | Google APIs ARM 64 v8a
- android-36.1 | Google APIs ARM 64 v8a
- android-36.1 | Google Play ARM 64 v8a
- android-36 | Google Play ARM 64 v8a
Android NDK: Not Found
IDEs:
Android Studio: 2025.2 AI-252.28238.7.2523.14688667
Xcode:
version: 16.2/16C5032a
path: /usr/bin/xcodebuild
Languages:
Java:
version: 22.0.2
path: /usr/bin/javac
Ruby:
version: 2.6.10
path: /usr/bin/ruby
npmPackages:
"@react-native-community/cli": Not Found
react: Not Found
react-native: Not Found
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: false
newArchEnabled: false
iOS:
hermesEnabled: true
newArchEnabled: true
Stacktrace or Logs
*** Assertion failure in -[RCTViewComponentView unmountChildComponentView:index:](), /Users/andreashogstrom/Code/react-native/packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm:173
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempt to unmount a view which has a different index. (parent: <RCTRootComponentView: 0x111039af0; frame = (0 0; 1032 1376); tag = 11; layer = <CALayer: 0x600000231400>>, child: <RCTParagraphComponentView: 0x110e67ec0; frame = (10 117; 1012 17); opaque = NO; tag = 628; layer = <CALayer: 0x60000031d7c0>; attributedText = Hello World{
EventEmitter = {length = 8, bytes = 0x1833700300600000};
NSBackgroundColor = "UIExtendedSRGBColorSpace 0 0 0 0";
NSColor = "UIExtendedSRGBColorSpace 0 0 0 1";
NSFont = "<UICTFont: 0x1111713e0> font-family: \".SFUI-Regular\"; font-weight: normal; font-style: normal; font-size: 14.00pt";
}>, index: 6, actual index: 9, tag at index: 624)'
*** First throw call stack:
(
0 CoreFoundation 0x00000001804b910c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x0000000180092da8 objc_exception_throw + 72
2 Foundation 0x0000000180e67e68 -[NSMutableDictionary(NSMutableDictionary) classForCoder] + 0
3 RNTester.debug.dylib 0x00000001074f5f74 -[RCTViewComponentView unmountChildComponentView:index:] + 2304
4 RNTester.debug.dylib 0x00000001074594f0 _ZL27RCTPerformMountInstructionsRKNSt3__16vectorIN8facebook5react18ShadowViewMutationENS_9allocatorIS3_EEEEP24RCTComponentViewRegistryR41RCTMountingTransactionObserverCoordinatori + 1340
5 RNTester.debug.dylib 0x0000000107458fa8 _ZZ41-[RCTMountingManager performTransaction:]ENK3$_1clERKN8facebook5react19MountingTransactionERKNS1_16SurfaceTelemetryE + 80
6 RNTester.debug.dylib 0x0000000107458f4c _ZNSt3__18__invokeB8de180100IRZ41-[RCTMountingManager performTransaction:]E3$_1JRKN8facebook5react19MountingTransactionERKNS4_16SurfaceTelemetryEEEEDTclclsr3stdE7declvalIT_EEspclsr3stdE7declvalIT 7 RNTester.debug.dylib 0x0000000107458ef4 _ZNSt3__128__invoke_void_return_wrapperIvLb1EE6__callB8de180100IJRZ41-[RCTMountingManager performTransaction:]E3$_1RKN8facebook5react19MountingTransactionERKNS6_16SurfaceTelemetryEEEEvDpOT_ + 40
8 RNTester.debug.dylib 0x0000000107458ec0 _ZNSt3__110__function12__alloc_funcIZ41-[RCTMountingManager performTransaction:]E3$_1NS_9allocatorIS2_EEFvRKN8facebook5react19MountingTransactionERKNS6_16SurfaceTelemetryEEEclB8de180100ES9_SC_ + 9 RNTester.debug.dylib 0x0000000107457d3c _ZNSt3__110__function6__funcIZ41-[RCTMountingManager performTransaction:]E3$_1NS_9allocatorIS2_EEFvRKN8facebook5react19MountingTransactionERKNS6_16SurfaceTelemetryEEEclES9_SC_ + 44
10 RNTester.debug.dylib 0x0000000107212cc4 _ZNKSt3__110__function12__value_funcIFvRKN8facebook5react19MountingTransactionERKNS3_16SurfaceTelemetryEEEclB8de180100ES6_S9_ + 84
11 RNTester.debug.dylib 0x0000000107211c28 _ZNKSt3__18functionIFvRKN8facebook5react19MountingTransactionERKNS2_16SurfaceTelemetryEEEclES5_S8_ + 40
12 RNTester.debug.dylib 0x0000000107211a58 _ZNK8facebook5react19TelemetryController15pullTransactionERKNSt3__18functionIFvRKNS0_19MountingTransactionERKNS0_16SurfaceTelemetryEEEESD_SD_ + 300
13 RNTester.debug.dylib 0x00000001074530c8 -[RCTMountingManager performTransaction:] + 564
14 RNTester.debug.dylib 0x0000000107452e44 -[RCTMountingManager initiateTransaction:] + 428
15 RNTester.debug.dylib 0x0000000107452820 __42-[RCTMountingManager scheduleTransaction:]_block_invoke + 324
16 RNTester.debug.dylib 0x0000000106f0f0f0 __RCTExecuteOnMainQueue_block_invoke + 40
17 libdispatch.dylib 0x0000000102ad8cd8 _dispatch_call_block_and_release + 24
18 libdispatch.dylib 0x0000000102ada5d0 _dispatch_client_callout + 16
19 libdispatch.dylib 0x0000000102aea41c _dispatch_main_queue_drain + 1228
20 libdispatch.dylib 0x0000000102ae9f40 _dispatch_main_queue_callback_4CF + 40
21 CoreFoundation 0x000000018041cdbc __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
22 CoreFoundation 0x0000000180417318 __CFRunLoopRun + 1944
23 CoreFoundation 0x0000000180416704 CFRunLoopRunSpecific + 552
24 GraphicsServices 0x0000000190604b10 GSEventRunModal + 160
25 UIKitCore 0x0000000185b39180 -[UIApplication _run] + 796
26 UIKitCore 0x0000000185b3d378 UIApplicationMain + 124
27 RNTester.debug.dylib 0x0000000106d657c4 __debug_main_executable_dylib_entry_point + 96
28 dyld 0x0000000102bed410 start_sim + 20
29 ??? 0x00000001025660e0 0x0 + 4334182624
30 ??? 0x1c56000000000000 0x0 + 2041819481059098624
)
libc++abi: terminating due to uncaught exception of type NSException