# Attempt to invoke virtual method 'java.lang.String us.zoom.internal.user.CmmUser.getScreenName()' on a null object reference

**URL:** <https://devforum.zoom.us/t/attempt-to-invoke-virtual-method-java-lang-string-us-zoom-internal-user-cmmuser-getscreenname-on-a-null-object-reference/100949>\
**Category:** Android\
**Created:** [December 29, 2023, 1:33pm UTC](https://devforum.zoom.us/t/attempt-to-invoke-virtual-method-java-lang-string-us-zoom-internal-user-cmmuser-getscreenname-on-a-null-object-reference/100949 "2023-12-29T13:33:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![paul.mathew](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/paul.mathew/32/53727_2.png) [@paul.mathew](https://devforum.zoom.us/u/paul.mathew)\
**Post date:** [December 29, 2023, 1:33pm UTC](https://devforum.zoom.us/t/attempt-to-invoke-virtual-method-java-lang-string-us-zoom-internal-user-cmmuser-getscreenname-on-a-null-object-reference/100949/1 "2023-12-29T13:33:30Z")

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We are working on App with zoom video calling using ZoomVideoSDK  
Version implementation ‘us.zoom.videosdk:ZoomVideoSDK:1.8.2’

What is happening is if we kill the application while having the video call or  
we use our PIP feature while video call and close the app using swipe and clear the PIP window then application is crashing and in crashlytics we are getting

**Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method ‘java.lang.String us.zoom.internal.user.CmmUser.getScreenName()’ on a null object reference**

```auto
       at us.zoom.sdk.e$a.a(ZoomVideoSDKImpl.java:31)
       at us.zoom.sdk.e$a.onChatNewMessageNotify(ZoomVideoSDKImpl.java:2)
       at us.zoom.internal.RTCConferenceEventUI.onChatNewMessageNotifyImpl(RTCConferenceEventUI.java:7)
       at us.zoom.internal.RTCConferenceEventUI.onChatNewMessageNotify(RTCConferenceEventUI.java:1)
       at us.zoom.internal.SDKEngine.heartBeatImpl(SDKEngine.java)
       at us.zoom.internal.SDKEngine.heartBeat(SDKEngine.java:1)
       at us.zoom.internal.SDKApplication$4.run(SDKApplication.java:8)
       at android.os.Handler.handleCallback(Handler.java:942)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8757)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

```

because of this error our application is crashing.  
how can I detect which part in my code this crash is happening or how to resolve this

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [January 28, 2024, 11:34pm UTC](https://devforum.zoom.us/t/attempt-to-invoke-virtual-method-java-lang-string-us-zoom-internal-user-cmmuser-getscreenname-on-a-null-object-reference/100949/2 "2024-01-28T23:34:26Z")

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Closed on January 28, 2024, 11:34pm UTC

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