Be more lenient with the power levels as they can still be missing at the time the various screens are created e.g. after accepting an invite.

The correct solution is to subscribe to update and update the UI accordingly when receiving them.

ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift

@@ -23,18 +23,14 @@ class ThreadTimelineScreenViewModel: ThreadTimelineScreenViewModelType, ThreadTi
         
         super.init(initialViewState: ThreadTimelineScreenViewState())
         
-        Task { [weak self] in
-            for await roomInfo in roomProxy.infoPublisher.receive(on: DispatchQueue.main).values {
-                guard !Task.isCancelled else {
-                    return
-                }
-                
-                self?.handleRoomInfoUpdate(roomInfo)
+        roomProxy.infoPublisher
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] roomInfo in
+                self?.updateRoomInfo(roomInfo)
             }
-        }
-        .store(in: &cancellables)
+            .store(in: &cancellables)
         
-        handleRoomInfoUpdate(roomProxy.infoPublisher.value)
+        updateRoomInfo(roomProxy.infoPublisher.value)
     }
     
     // MARK: - Public
@@ -62,8 +58,9 @@ class ThreadTimelineScreenViewModel: ThreadTimelineScreenViewModelType, ThreadTi
     
     // MARK: - Private
     
-    private func handleRoomInfoUpdate(_ roomInfo: RoomInfoProxyProtocol) {
-        guard let powerLevels = roomInfo.powerLevels else { fatalError("Missing room power levels") }
-        state.canSendMessage = powerLevels.canOwnUser(sendMessage: .roomMessage)
+    private func updateRoomInfo(_ roomInfo: RoomInfoProxyProtocol) {
+        if let powerLevels = roomInfo.powerLevels {
+            state.canSendMessage = powerLevels.canOwnUser(sendMessage: .roomMessage)
+        }
     }
 }