Error in Editor window when positiong mouse pointer inside query statement: "ActiproSoftware.Synt (4229146)

User enters a Select query statement in Editor window. He places his mouse pointer inside the query statement, for example, before a column name in order to change the statement. At this point, the following error occurs:

"Exception: System.ArgumentOutOfRangeException
Message : Specified argument was out of the range of valid values.
Parameter name: index
Stack Trace:
at ActiproSoftware.SyntaxEditor.DocumentLineCollection.get_Item(Int32 index)
at Quest.Toad.QueryBuilder.SqlBuilder.ShowDateRangeInfoIfOverLink(EditorControl editorControl)
at Quest.Toad.Editor.EditorForm.<.ctor>b__3(Object sender, MouseEventArgs e)
at System.Windows.Forms.Control.OnMouseUp(MouseEventArgs e)
at ActiproSoftware.WinUICore.UIControl.OnMouseUp(MouseEventArgs e)
at ActiproSoftware.SyntaxEditor.SyntaxEditor.OnMouseUp(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)..."