# Random exception thrown by app

**URL:** <https://devforum.zoom.us/t/random-exception-thrown-by-app/48249>\
**Category:** Android\
**Created:** [April 18, 2021, 8:15pm UTC](https://devforum.zoom.us/t/random-exception-thrown-by-app/48249 "2021-04-18T20:15:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![abduljav123](https://avatars.discourse-cdn.com/v4/letter/a/9de0a6/32.png) [@abduljav123](https://devforum.zoom.us/u/abduljav123)\
**Post date:** [April 18, 2021, 8:15pm UTC](https://devforum.zoom.us/t/random-exception-thrown-by-app/48249/1 "2021-04-18T20:15:48Z")

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**Description**  
Ive implemented zoom sdk into my android application but the app randomly starts throwing a NullPointerException and after sometime magically returns to normal. I cannot pinpoint where or why this exception arises. Perhaps you guys can help me:

> 2021-04-19 01:05:18.621 14686-14686/? E/ashbacksliveap: Unknown bits set in runtime\_flags: 0x8000  
> 2021-04-19 01:05:27.070 14686-14686/com.example.flashbacksliveapp E/AndroidRuntime: FATAL EXCEPTION: main  
> Process: com.example.flashbacksliveapp, PID: 14686  
> java.lang.NullPointerException: Attempt to invoke interface method ‘int us.zoom.sdk.MeetingService.joinMeetingWithParams(android.content.Context, us.zoom.sdk.JoinMeetingParams, us.zoom.sdk.JoinMeetingOptions)’ on a null object reference  
> at com.example.flashbacksliveapp.MainActivity.joinMeeting(MainActivity.java:343)  
> at com.example.flashbacksliveapp.MainActivity.access$600(MainActivity.java:39)  
> at com.example.flashbacksliveapp.MainActivity$5.onDataChange(MainActivity.java:359)  
> at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:75)  
> at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63)  
> at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55)  
> at android.os.Handler.handleCallback(Handler.java:883)  
> at android.os.Handler.dispatchMessage(Handler.java:100)  
> at android.os.Looper.loop(Looper.java:214)  
> at android.app.ActivityThread.main(ActivityThread.java:7356)  
> at java.lang.reflect.Method.invoke(Native Method)  
> at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)  
> at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

**Which Android Client SDK version?**  
5.5.1.1317 (latest)

**Smartphone**

- Samsung Galaxy s7 (android 9)

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**Author:** ![donny.bao](https://avatars.discourse-cdn.com/v4/letter/d/a587f6/32.png) [@donny.bao](https://devforum.zoom.us/u/donny.bao)\
**Post date:** [April 19, 2021, 10:15am UTC](https://devforum.zoom.us/t/random-exception-thrown-by-app/48249/2 "2021-04-19T10:15:09Z")

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Hi @abduljav123 Please check whether you call joinMeetingWithParams method after initialization, you can receive ZoomSDKInitializeListener.onZoomSDKInitializeResult callback when initialization successfully

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**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:** [May 19, 2021, 8:15pm UTC](https://devforum.zoom.us/t/random-exception-thrown-by-app/48249/3 "2021-05-19T20:15:51Z")

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