Android crash in Google automated tests: onAccessibilityStateChanged: Cannot read properties of null (reading 'set') #11049
Description
Issue Description
We’re seeing an Android crash that we can reproduce only in Google Play Console automated testing / pre-launch reports (x86 virtual device). We can’t reproduce it locally on physical devices/emulators, but the stack trace consistently points to the accessibility callback path and the fix below stops it in Google tests.
Exception com.tns.NativeScriptException: Calling js method onAccessibilityStateChanged failed
TypeError: Cannot read properties of null (reading 'set')
at com.tns.Runtime.callJSMethodNative
at com.tns.Runtime.dispatchCallJSMethodNative (Runtime.java:1384)
at com.tns.Runtime.callJSMethodImpl (Runtime.java:1270)
at com.tns.Runtime.callJSMethod (Runtime.java:1257)
at com.tns.Runtime.callJSMethod (Runtime.java:1235)
at com.tns.Runtime.callJSMethod (Runtime.java:1231)
at com.tns.gen.android.view.accessibility.AccessibilityManager_AccessibilityStateChangeListener.onAccessibilityStateChanged (AccessibilityManager_AccessibilityStateChangeListener.java:19)
at android.view.accessibility.AccessibilityManager.lambda$notifyAccessibilityStateChanged$0 (AccessibilityManager.java:1710)
at android.view.accessibility.AccessibilityManager$$ExternalSyntheticLambda0.run (Unknown Source:4)
at android.os.Handler.handleCallback (Handler.java:938)
at android.os.Handler.dispatchMessage (Handler.java:99)
at android.os.Looper.loopOnce (Looper.java:201)
at android.os.Looper.loop (Looper.java:288)
at android.app.ActivityThread.main (ActivityThread.java:7870)
at java.lang.reflect.Method.invoke
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1003)
Suspected root cause in NativeScript core
application.android.ts
updateAccessibilityState() calls:
sharedA11YObservable.set(...)
but sharedA11YObservable can be undefined.
After applying this patch to updateAccessibilityState function, the crash stopped appearing in Google automated testing:
if (!sharedA11YObservable) {
return;
}
function updateAccessibilityState() {
if (!sharedA11YObservable) {
return;
}
const accessibilityManager = getAndroidAccessibilityManager();
if (!accessibilityManager) {
sharedA11YObservable.set(accessibilityStateEnabledPropName, false);
sharedA11YObservable.set(touchExplorationStateEnabledPropName, false);
return;
}
sharedA11YObservable.set(accessibilityStateEnabledPropName, !!accessibilityManager.isEnabled());
sharedA11YObservable.set(touchExplorationStateEnabledPropName, !!accessibilityManager.isTouchExplorationEnabled());
}
Reproduction
We cannot reproduce this crash manually.
It appears only in Google Play automated testing / pre-launch reports on an x86 virtual device.
Relevant log output (if applicable)
Environment
OS: macOS 26.2
CPU: (16) arm64 Apple M4 Max
Shell: /bin/zsh
node: 25.1.0
npm: 11.6.2
nativescript: 9.0.1
# android
java: 17.0.17
ndk: Not Found
apis: Not Found
build_tools: Not Found
system_images: Not Found
# ios
xcode: 26.0.1/17A400
cocoapods: 1.16.2
python: Not Found
python3: 3.9.6
ruby: 3.3.10
platforms:
- DriverKit 25.0
- iOS 26.0
- macOS 26.0
- tvOS 26.0
- visionOS 26.0
- watchOS 26.0Dependencies
"devDependencies": {
"@angular-devkit/build-angular": "~16.2.0",
"@angular/compiler-cli": "~16.2.0",
"@nativescript/android": "9.0.2",
"@nativescript/ios": "9.0.2",
"@nativescript/types": "9.0.0",
"@nativescript/webpack": "5.0.29",
"@ngtools/webpack": "~16.2.0",
"@types/url-parse": "^1.4.11",
"process": "^0.11.10",
"typescript": "5.1.6",
"util": "^0.12.5"
}Please accept these terms
- I have searched the existing issues as well as StackOverflow and this has not been posted before
- This is a bug report
- I agree to follow this project's Code of Conduct