Bug #66313 Trying to edit a tale

Description:
Clicking or choosing edit table

----- Developer Notes -----

MySQL Workbench CE for Windows version 5.2.41  revision 9727
Configuration Directory: C:\Users\dagb\AppData\Roaming\MySQL\Workbench
Data Directory: C:\Program Files (x86)\MySQL\MySQL Workbench 5.2 CE
Cairo Version: 1.8.8
OS: Microsoft Windows 7  Service Pack 1 (build 7601), 64-bit
CPU: 4x Intel(R) Core(TM) i7 CPU       M 620  @ 2.67GHz, 5.9 GiB RAM
Active video adapter (0): NVIDIA NVS 3100M
Installed video RAM: 512 MB
Current video mode: 1600 x 900 x 4294967296 colors
Used bit depth: 32
Driver version: 8.17.12.9683
Installed display drivers: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Active video adapter (1): LogMeIn Mirror Driver
Installed video RAM: 0 MB
Current video mode: 1920 x 1200 x 4294967296 colors
Used bit depth: 32
Driver version: 7.1.542.0
Installed display drivers: NULL
Current user language: Norwegian, Bokmål (Norway)

Exception = System.InvalidCastException
Message = Unable to cast object of type 'MySQL.Forms.ToolBarItemImpl' to type 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
FullText = System.InvalidCastException: Unable to cast object of type 'MySQL.Forms.ToolBarItemImpl' to type 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
   at MySQL.GUI.Workbench.Plugins.DockablePlugin.GetFromFixedPtr(IntPtr ptr)
   at MySQL.GUI.Workbench.MainForm.ShowPlugin(IntPtr ptr)
   at MySQL.Forms.AppImpl.show_editor_wrapper(UInt32 native_handle)
   at boost.detail.function.void_function_invoker1<void (__cdecl*)(unsigned int),void,unsigned int>.invoke(function_buffer* function_ptr, UInt32 a0)
   at MySQL.Grt.ListModel.activate_popup_item_for_nodes(String name, List`1 nodes)
   at MySQL.GUI.Workbench.ModelCatalogForm.contextMenuClick(Object sender, EventArgs e)
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

How to repeat:
trying to close and reopen workbench. the error occurs

Duplicate of bug #66013