AGS Crash (not sure where to post this.)

[ironhide1975]

Error: Index and length must refer to a location within the string.
Parameter name: length
Version: AGS 3.6.2.11

System.ArgumentOutOfRangeException: Index and length must refer to a location within the string.
Parameter name: length
   at System.String.Substring(Int32 startIndex, Int32 length)
   at AGS.Editor.ScintillaWrapper.GetPreviousPathedExpression(Int32 startAtPos, Boolean skipSpacesBeforeCursor)
   at AGS.Editor.ScintillaWrapper.ParsePreviousExpression(Int32 startAtPos, String& charactersAfterDot, Boolean& staticAccess, Boolean& isThis)
   at AGS.Editor.ScintillaWrapper.GetFullTypeNameAtPosition(Int32 charIndex)
   at AGS.Editor.ScriptEditorBase.UpdateScriptDocumentContext(Int32 clickedPositionInDocument)
   at AGS.Editor.ScriptEditorBase.UpdateUICommands()
   at AGS.Editor.ScriptEditorBase.scintilla_UpdateUI(Object sender, EventArgs e)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at AGS.Editor.ScintillaWrapper.OnUpdateUI(Object sender, EventArgs e)
   at ScintillaNET.Scintilla.OnUpdateUI(UpdateUIEventArgs e)
   at ScintillaNET.Scintilla.WmReflectNotify(Message& m)
   at ScintillaNET.Scintilla.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)

[Crimson Wizard]

Please tell when and under which circumstances did this happen?

Does this happen regularly, or happened once?