Bug #66673 error

Description:
Creating roles

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

MySQL Workbench CE for Windows version 5.2.42  revision 9752
Configuration Directory: C:\Users\deoma\AppData\Roaming\MySQL\Workbench
Data Directory: C:\Program Files (x86)\MySQL\MySQL Workbench CE 5.2.42
Cairo Version: 1.8.8
OS: Microsoft Windows 7 Home Premium Edition Service Pack 1 (build 7601), 64-bit
CPU: 8x Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz, 6.0 GiB RAM
Active video adapter (0): Intel(R) HD Graphics Family
Installed video RAM: -1274 MB
Current video mode: 1366 x 768 x 4294967296 colors
Used bit depth: 32
Driver version: 8.15.10.2476
Installed display drivers: igdumd64.dll,igd10umd64.dll,igd10umd64.dll,igdumdx32,igd10umd32,igd10umd32
Current user language: English (United States)

Exception = System.NullReferenceException
Message = Object reference not set to an instance of an object.
FullText = System.NullReferenceException: Object reference not set to an instance of an object.
   at MySQL.Grt.ListModel.get_field(NodeId node, Int32 column, String& value)
   at MySQL.Grt.SimpleGrtTreeModel.ValueNeeded(Object sender, NodeControlValueEventArgs e)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Aga.Controls.Tree.NodeControls.BindableControl.OnValueNeeded(NodeControlValueEventArgs args)
   at Aga.Controls.Tree.NodeControls.BindableControl.GetValue(TreeNodeAdv node)
   at Aga.Controls.Tree.NodeControls.BaseTextControl.GetLabel(TreeNodeAdv node)
   at Aga.Controls.Tree.NodeControls.BaseTextControl.MeasureSize(TreeNodeAdv node, DrawContext context)
   at Aga.Controls.Tree.NodeControls.NodeControl.GetActualSize(TreeNodeAdv node, DrawContext context)
   at Aga.Controls.Tree.TreeViewAdv.<GetNodeControls>d__f.MoveNext()
   at Aga.Controls.Tree.TreeViewAdv.GetNodeBounds(IEnumerable`1 nodeControls)
   at Aga.Controls.Tree.TreeViewAdv.GetNodeWidth(TreeNodeAdv node)
   at Aga.Controls.Tree.TreeViewAdv.CreateRowMap()
   at Aga.Controls.Tree.TreeViewAdv.UnsafeFullUpdate()
   at Aga.Controls.Tree.TreeViewAdv.FullUpdate()
   at Aga.Controls.Tree.TreeViewAdv.SetIsExpanded(TreeNodeAdv node, Boolean value)
   at Aga.Controls.Tree.TreeViewAdv.SetIsExpanded(ExpandArgs eargs)
   at Aga.Controls.Tree.TreeViewAdv.SetIsExpanded(TreeNodeAdv node, Boolean value, Boolean ignoreChildren)
   at Aga.Controls.Tree.TreeViewAdv.CreateNodes()
   at Aga.Controls.Tree.TreeViewAdv.set_Model(ITreeModel value)
   at MySQL.GUI.Workbench.Plugins.DbMysqlUserEditor.RefreshAssignedRoles()
   at MySQL.GUI.Workbench.Plugins.DbMysqlUserEditor.addRoleButton_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.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:
How do I create roles

Can you provide a step by step description of what you tried to trigger this bug?

No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".