Crash

```
Thread: Crypto_Thread, Exception: java.lang.NullPointerException
at org.matrix.android.sdk.internal.crypto.MXOlmDevice.addInboundGroupSession(MXOlmDevice.kt:6)
at org.matrix.android.sdk.internal.crypto.algorithms.megolm.MXMegolmDecryption.onRoomKeyEvent(MXMegolmDecryption.kt:61)
at org.matrix.android.sdk.internal.crypto.DefaultCryptoService$onToDeviceEvent$1.invokeSuspend(DefaultCryptoService.kt:165)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:3)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:18)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.os.HandlerThread.run(HandlerThread.java:65)
```