Can't save project after modifying

Hi Dusan,

I can't save my project after updating to 11.91. Here's the stack dump:

SoftwareIdeasModeler.Core.CommandProcessing.CommandException: Exception during execution the command: Save ---> System.ArgumentOutOfRangeException: StartIndex cannot be less than zero.

Parameter name: startIndex

at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)

at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)

at SoftwareIdeasModeler.Core.CommandProcessing.ApplicationAction.Perform()

at SoftwareIdeasModeler.Core.CommandProcessing.ApplicationCommandProcessor.Execute(UnitOfWork unitOfWork, CommandDefinition commandDefinition, ActionCallback actionCallback, Object callbackTag, Boolean calledFromAnotherAction, CommandArgument[] arguments)

--- End of inner exception stack trace ---

at SoftwareIdeasModeler.Core.CommandProcessing.ApplicationCommandProcessor.Execute(UnitOfWork unitOfWork, CommandDefinition commandDefinition, ActionCallback actionCallback, Object callbackTag, Boolean calledFromAnotherAction, CommandArgument[] arguments)

at SoftwareIdeasModeler.MainForm.ribbonBar_RibbonButtonClicked(Object sender, RibbonButtonEventArgs e)

at SoftwareIdeas.Ribbon.RibbonForms.RibbonTitle.TitleRibbon_RibbonButtonClicked(Object sender, RibbonButtonEventArgs e)

at SoftwareIdeas.Ribbon.RibbonControl.RibbonButton.OnClick(EventArgs e)

at SoftwareIdeas.Ribbon.RibbonControl.RibbonItem.MouseUp(MouseEventArgs e)

at SoftwareIdeas.Ribbon.RibbonControl.RibbonBarBody.OnMouseUp(MouseEventArgs e)

at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.UserControl.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

OF=SoftwareIdeasModeler.MainForm

LastCmd=SoftwareIdeas.Common.Commands.CombinedCommand