NullReferenceException may occur at DevExpress.XtraBars.Ribbon.ViewInfo.BaseRibbonViewInfo.OnHotObjectChanging or DevExpress.XtraBars.BarItemLink.CreateViewInfo with the 15.1.7.15281 hotfix

Please provide the hotfix soon…

We'll do our best to prepare a hotfix as soon as possible.We need some time to perform all the required tests. Once the hotfix is available, you'll receive an automatic notification.

Well - still the same exception:
The error occurred:
Type:       NullReferenceException
Message:    Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
Data:       0 entries
Stack trace:
  bei DevExpress.XtraBars.Ribbon.ViewInfo.BaseRibbonViewInfo.OnHotObjectChanging(RibbonHitInfo prev, RibbonHitInfo current)
  bei DevExpress.XtraBars.Ribbon.ViewInfo.RibbonViewInfo.OnHotObjectChanging(RibbonHitInfo prev, RibbonHitInfo current)
  bei DevExpress.XtraBars.Ribbon.ViewInfo.BaseRibbonViewInfo.set_HotObject(RibbonHitInfo value)
  bei DevExpress.XtraBars.Ribbon.ViewInfo.RibbonViewInfo.set_HotObject(RibbonHitInfo value)
  bei DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.UpdateHotObject(DXMouseEventArgs e, Boolean forceUpdate)
  bei DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnUnPressItem(DXMouseEventArgs e, RibbonHitInfo hitInfo)
  bei DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnUnPress(DXMouseEventArgs e, RibbonHitInfo hitInfo)
  bei DevExpress.XtraBars.Ribbon.Handler.BaseRibbonHandler.OnMouseUp(DXMouseEventArgs e)
  bei DevExpress.XtraBars.Ribbon.Handler.RibbonHandler.OnMouseUp(DXMouseEventArgs e)
  bei DevExpress.XtraBars.Ribbon.RibbonControl.OnMouseUp(MouseEventArgs e)
  bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
  bei System.Windows.Forms.Control.WndProc(Message& m)
  bei DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
  bei DevExpress.XtraBars.Ribbon.RibbonControl.WndProc(Message& m)
  bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
InnerException is null

Screenshot

Hello,
We weren't able to reproduce this issue with the latest hotfix. As I can see in your screenshot, this exception can't be thrown in this line since there is a null check for the prev parameter, and other fields / variables are not accessed. Moreover, this code shouldn't be reached if a BarManager instance is destroyed.
It would be greatly appreciated if you perform a test: reproduce this exception and go to the OnUnPressItem method in the callstack. Put a breakpoint at the line where the IsDestroying property is checked. Then, perform the same reproduction steps and debug the code starting from the mentioned line. Check the IsDestroying property's value and the prev parameter in the OnHotObjectChanging method. It would be also helpful if you record all these operations (you can use the free Jing tool, for example).
I'm looking forward to your results.

Can you please at least take a look at the prev.SetItem(null, RibbonHitTest.None); call? Inside this method you access the parameter - which is null?

Thank you for the clarification, now I see what you mean. The cause of this confusion is that we didn't reach this code during our testing, and if we had reached it, the exception would have been thrown inside the SetItem method. It appears that the debugger doesn't show the correct place.
As for this issue, we'll do our best to reproduce it and test the fix properly. If you have any information (reproduction steps, a sample project) that may help us, please let us know.
We'll update this thread once we have any results.

Thx Olga - i have posted that part (SetItem) already 5 days ago - see above ;)
Another issue now is that somehow in my xaf application the home menu is gone. everything works fine with Build 15272 - now with 15292 when i open an listview - Home ribbon page disappears!?
Again - i cannot repro it with xaf maindemo. what was changed in this latest build about ribbon merging?

Hello Martin,
Yes, I saw your comment regarding the SetItem method, but I didn't research in detail what changes were introduced to fix the initial issues. Since I wasn't able to reproduce this exception with the latest hotfix, I considered this issue fixed (until you posted your comment). And then, I was slightly confused by your screenshot (where the exception is not thrown inside the SetItem method).
As for your question about recent changes, I couldn't find obvious modifications affecting ribbon merging. It appears that we need to reproduce this behavior to find a solution. Is it possible to send us a sample project?

Thx Olga. As for the other issue - i posted an ticket to the xaf team - https://www.devexpress.com/Support/Center/Question/Details/T301896. Currently i cannot reproduce it in dex demos, only in my solution…

OK, thank you for your cooperation. We'll try to reproduce the described behavior and address that inquiry as soon as possible.