diff --git a/CHANGES.rst b/CHANGES.rst
index 4f393ff59..0d9d4d25b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -15,6 +15,7 @@ Changes to be released in next version
  * Settings: Disabled autocorrection when entering an identity server (#4593).
  * Room Notification Settings: Fix Crash when opening the new Room Notification Settings Screen (Not yet released) (#4599).
  * AuthenticationViewController: Fix crash on authentication if an intermediate view was presented (#4606).
+ * Room: Fixed crash when opening a read-only room.
 
 ⚠️ API Changes
  * 
diff --git a/Riot/Modules/Room/RoomViewController.m b/Riot/Modules/Room/RoomViewController.m
index 8d32e11e8..56542e5cc 100644
--- a/Riot/Modules/Room/RoomViewController.m
+++ b/Riot/Modules/Room/RoomViewController.m
@@ -1126,7 +1126,11 @@ const NSTimeInterval kResizeComposerAnimationDuration = .05;
     {
         [super setRoomInputToolbarViewClass:roomInputToolbarViewClass];
         
-        [(RoomInputToolbarView *)self.inputToolbarView setVoiceMessageToolbarView:self.voiceMessageController.voiceMessageToolbarView];
+        // The voice message toolbar cannot be set on DisabledInputToolbarView.
+        if ([self.inputToolbarView isKindOfClass:RoomInputToolbarView.class])
+        {
+            [(RoomInputToolbarView *)self.inputToolbarView setVoiceMessageToolbarView:self.voiceMessageController.voiceMessageToolbarView];
+        }
         
         [self updateInputToolBarViewHeight];
     }