app crash while in call

Steps to reproduce

1. join call
   • used sermo, so with hpb
   • tested on redmi note 7
2. stay in call for a while

Expected behaviour

no crash

Actual behaviour

app suddenly crashed. error:

2022-10-13 15:05:22.960 19497-20390 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.961 19497-20269 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.962 19497-20462 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.962 19497-20397 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.962 19497-20380 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.962 19497-20473 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.962 19497-20254 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.967 19497-19510 nextcloud.talk          com.nextcloud.talk2                  I  Background concurrent copying GC freed 282527(12MB) AllocSpace objects, 0(0B) LOS objects, 49% free, 12MB/25MB, paused 466us total 207.028ms
2022-10-13 15:05:22.971 19497-19512 System                  com.nextcloud.talk2                  E  Uncaught exception thrown by finalizer
2022-10-13 15:05:22.973 19497-19512 System                  com.nextcloud.talk2                  E  java.lang.NullPointerException: Attempt to do a synchronize operation on a null object
                                                                                                    	at android.view.Surface.release(Surface.java:254)
                                                                                                    	at android.view.Surface.finalize(Surface.java:242)
                                                                                                    	at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:291)
                                                                                                    	at java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:278)
                                                                                                    	at java.lang.Daemons$Daemon.run(Daemons.java:139)
                                                                                                    	at java.lang.Thread.run(Thread.java:919)
2022-10-13 15:05:22.992 19497-20390 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.993 19497-20269 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.993 19497-20473 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.993 19497-20397 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.993 19497-20380 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface
2022-10-13 15:05:22.993 19497-20237 org.webrtc.Logging      com.nextcloud.talk2                  I  EglRenderer: surface_viewDropping frame - No surface

Device brand and model

redmi note 7

Android version

10

Nextcloud Talk app version

15.1.0 Alpha 05

Nextcloud server version

No response

Talk version

No response

Custom Signaling server configured

No response

Custom TURN server configured

No response

Custom STUN server configured

No response

Android logs

No response

Server log

No response

Additional information

No response

Start by reproducing the crash during a call on a Redmi Note 7 running Android 10, using the reported WebRTC EglRenderer and Surface finalizer logs as the first evidence. Investigate the call and surface lifecycle around the reported java.lang.NullPointerException; done means the app no longer crashes after remaining in a call for a while.