Bug #50827 Suddenly appear this error on change view mode

Description:
Exception = System.ArgumentOutOfRangeException
Message = El índice estaba fuera del intervalo. Debe ser un valor no negativo e inferior al tamaño de la colección.
Nombre del parámetro: index
FullText = System.ArgumentOutOfRangeException: El índice estaba fuera del intervalo. Debe ser un valor no negativo e inferior al tamaño de la colección.
Nombre del parámetro: index
   en System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   en System.ThrowHelper.ThrowArgumentOutOfRangeException()
   en System.Collections.Generic.List`1.get_Item(Int32 index)
   en System.Collections.ObjectModel.ReadOnlyCollection`1.get_Item(Int32 index)
   en MySQL.GUI.Workbench.MainForm.mainDockPanel_ActiveDocumentChanged(Object sender, EventArgs e)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.OnActiveDocumentChanged(EventArgs e)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.RefreshActiveWindow()
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.HookEventHandler(Object sender, HookEventArgs e)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.LocalWindowsHook.OnHookInvoked(HookEventArgs e)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.LocalWindowsHook.CoreHookProc(Int32 code, IntPtr wParam, IntPtr lParam)
   en WeifenLuo.WinFormsUI.Docking.NativeMethods.CallNextHookEx(IntPtr hhook, Int32 code, IntPtr wParam, IntPtr lParam)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.LocalWindowsHook.CoreHookProc(Int32 code, IntPtr wParam, IntPtr lParam)
   en WeifenLuo.WinFormsUI.Docking.NativeMethods.CallNextHookEx(IntPtr hhook, Int32 code, IntPtr wParam, IntPtr lParam)
   en WeifenLuo.WinFormsUI.Docking.DockPanel.FocusManagerImpl.LocalWindowsHook.CoreHookProc(Int32 code, IntPtr wParam, IntPtr lParam)
   en System.Windows.Forms.UnsafeNativeMethods.SetFocus(HandleRef hWnd)
   en System.Windows.Forms.ContainerControl.FocusActiveControlInternal()
   en System.Windows.Forms.ContainerControl.SetActiveControlInternal(Control value)
   en System.Windows.Forms.ContainerControl.SetActiveControl(Control ctl)
   en System.Windows.Forms.ContainerControl.set_ActiveControl(Control value)
   en System.Windows.Forms.Control.Select(Boolean directed, Boolean forward)
   en System.Windows.Forms.Control.SelectNextControl(Control ctl, Boolean forward, Boolean tabStopOnly, Boolean nested, Boolean wrap)
   en System.Windows.Forms.Control.SelectNextControlInternal(Control ctl, Boolean forward, Boolean tabStopOnly, Boolean nested, Boolean wrap)
   en System.Windows.Forms.Control.SelectNextIfFocused()
   en System.Windows.Forms.Control.SetVisibleCore(Boolean value)
   en System.Windows.Forms.Form.SetVisibleCore(Boolean value)
   en System.Windows.Forms.Control.set_Visible(Boolean value)
   en WeifenLuo.WinFormsUI.Docking.DockContentHandler.SetVisible()
   en WeifenLuo.WinFormsUI.Docking.DockPane.set_ActiveContent(IDockContent value)
   en WeifenLuo.WinFormsUI.Docking.DockPaneStripBase.OnMouseDown(MouseEventArgs e)
   en System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   en System.Windows.Forms.Control.WndProc(Message& m)
   en WeifenLuo.WinFormsUI.Docking.DockPaneStripBase.WndProc(Message& m)
   en System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   en System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

How to repeat:
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Hi Silvia,

do you remember what you've been doing in WB when the error occurred, or is it even repeatable for you?

No, sorry. It appears suddenly and I don't remember how it happens.

i can't repeat on my windows boxes

We need to know exactly what you did to get this.

We need to be able to repeat this.

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