Exception:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.nfc.NfcAdapter.disableReaderMode(android.app.Activity)' on a null object reference
at org.chromium.device.nfc.NfcImpl.disableReaderMode	(NfcImpl.java:370 )
at org.chromium.device.nfc.NfcImpl.close	(NfcImpl.java:236 )
at org.chromium.content.browser.InterfaceRegistrar$NfcImplementationFactory$ContextAwareNfcImpl.close	(InterfaceRegistrar.java:83 )
at org.chromium.mojo.bindings.Interface$Stub.close	(Interface.java:305 )
at org.chromium.mojo.bindings.RouterImpl$HandleIncomingMessageThunk.close	(RouterImpl.java:3247 )
at org.chromium.mojo.bindings.Connector.close	(Connector.java:132 )
at org.chromium.mojo.bindings.Connector.onError	(Connector.java:159 )
at org.chromium.mojo.bindings.Connector$WatcherCallback.onResult	(Connector.java:1154 )
at org.chromium.mojo.system.impl.WatcherImpl.onHandleReady	(WatcherImpl.java:53 )
at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce	(Native Method )
at org.chromium.base.SystemMessageHandler.handleMessage	(SystemMessageHandler.java:41 )
at android.os.Handler.dispatchMessage	(Handler.java:102 )
at android.os.Looper.loop	(Looper.java:148 )
at android.app.ActivityThread.main	(ActivityThread.java:5417 )
at java.lang.reflect.Method.invoke	(Native Method )
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run	(ZygoteInit.java:726 )
at com.android.internal.os.ZygoteInit.main	(ZygoteInit.java:616 )

Users experienced this crash on the following builds:

Android Dev 54.0.2837.2 -  4.94 CPM, 16 reports, 9 clients (signature [Android Java Exception] java.lang.NullPointerException at org.chromium.content.browser.InterfaceRegistrar$NfcImplementationFactory$ContextAwareNfcImpl.close(InterfaceRegistrar.java))

If this update was incorrect, please add "Fracas-Wrong" label to prevent future updates.

- Go/Fracas

This crash is found randomly on M54-54.0.2838.0 while following below steps on Spice Mi-498/MOB30W


Precondition : 
1. User should be signed in to get snippets 
2. Reader Mode flag should be ON

Steps to reproduce: 
1.  Launch Chrome> Force Stop Chrome and Relaunch> Slide down the NTP to see Snippets
2. Tap on any snippet and immediately on Microphone icon of omnibox
3. After page is loaded in background, speak anything in Speak Now microphone > Observe 

Observed behavior: 
Chrome crashes while page loads 

Expected behavior: 
Chrome should never crash

Frequency: 1/5

Note: Please find logs and screen record @ http://go/chrome-androidlogs1/6/640892

CL Range: https://chromium.googlesource.com/chromium/src/+log/54.0.2832.0..54.0.2838.0?pretty=fuller&n=10000
Suspected CL : https://chromium.googlesource.com/chromium/src/+/3466b6197a8071043533c7adde2b303438ff565d
 
Looks like CL is related to alexander.shalamov@intel.com, but can not assign since he is not a project member (no chromium ID). Adding " Stability-Sheriff-Android" Label Can some please look in to it and reroute this bug, Thanks!

Please fix the NPE in NfcImpl.java, not sure if adding null guards on mNfcAdapter is desired or there's a deeper issue.

[Bulk edit]

This issue is listed as a release block stable for M54 Android.  We'll be cutting our stable candidate in just about two weeks, so time is running out to fix this bug - please prioritize working on it ASAP.

Are you sure this issue shouldn't block the release?  Remove the ReleaseBlock-Stable label.
Unsure if this issue should block the release, or know the issue should block the release but we won't be able to fix it in time?  CC me so that we can discuss.

Thanks!

We should get this fixed, but it's not crashing enough to track as an RB-Stable.  Please work on fixing ASAP, and if you find a fix, please request a merge for that release.

This is a duplicate of https://bugs.chromium.org/p/chromium/issues/detail?id=640995 which is fixed and merged to M54