Crash

```
Thread: TIMELINE_DB_THREAD, Exception: java.lang.IllegalStateException: This Realm instance has already been closed, making it unusable.
at io.realm.BaseRealm.checkIfValid(BaseRealm.java:4)
at io.realm.RealmResults.isLoaded(RealmResults.java:1)
at io.realm.OrderedRealmCollectionImpl.size(OrderedRealmCollectionImpl.java:1)
at java.util.AbstractCollection.isEmpty(AbstractCollection.java:86)
at kotlin.collections.ArraysKt___ArraysKt.lastOrNull(_Arrays.kt:1)
at org.matrix.android.sdk.internal.session.room.timeline.DefaultTimeline.updateLoadingStates(DefaultTimeline.kt:1)
at org.matrix.android.sdk.internal.session.room.timeline.-$$Lambda$DefaultTimeline$tC-oE64ca7DHOAmRKjLcS9S49q0.run(lambda:3)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:246)
at android.os.HandlerThread.run(HandlerThread.java:67)
```