Fatal error during execution

Hi everybody,

i coded this simple utility that allows the user to edit some dbtext without using the mouse (after selection).

It works but sometimes, it seems randomly, i get a fatal error.

This is the code

public void Run(object param)
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = doc.Editor;
Database db = doc.Database;

PromptSelectionOptions pso = new PromptSelectionOptions();
pso.MessageForAdding = "\nSelect texts";
pso.AllowDuplicates = false;
pso.AllowSubSelections = false;

SelectionFilter sf = new SelectionFilter(new TypedValue[] { new TypedValue((int)DxfCode.Start, "TEXT") });

PromptSelectionResult psr = ed.GetSelection(pso, sf);
if (psr.Status != PromptStatus.OK)
return;

foreach (SelectedObject so in psr.Value)
{
ed.SetImpliedSelection(new ObjectId[] { so.ObjectId });
executeSyncro("_textedit ");
}

ed.Regen();
}

void executeSyncro(string command)
{
AcadApplication app = (AcadApplication)Application.AcadApplication;
app.ActiveDocument.SendCommand(command);
}

The run function it's called from a commandmethod with the CommandFlags.Session flag.

Where's the problem?

Thanks