Fix application crashing when opening a thread with RTE enabled

Riot/Modules/Room/RoomViewController.m

@@ -1194,6 +1194,12 @@ static CGSize kThreadListBarButtonItemImageSize;
 - (void)updateRoomInputToolbarViewClassIfNeeded
 {
     Class roomInputToolbarViewClass = [RoomViewController mainToolbarClass];
+
+    // If RTE is enabled, delay the toolbar setup until `completionSuggestionCoordinator` is ready.
+    if (roomInputToolbarViewClass == WysiwygInputToolbarView.class && _completionSuggestionCoordinator == nil)
+    {
+        return;
+    }
     
     BOOL shouldDismissContextualMenu = NO;