Index: trunk/MagicSoft/Mars/mmontecarlo/MMcTriggerRateCalc.cc
===================================================================
--- trunk/MagicSoft/Mars/mmontecarlo/MMcTriggerRateCalc.cc	(revision 1792)
+++ trunk/MagicSoft/Mars/mmontecarlo/MMcTriggerRateCalc.cc	(revision 1797)
@@ -142,6 +142,10 @@
 	GetRate(i)->SetEnergyMax(fMcCorRunHeader->GetEUppLim()/1000.);
 
-	TString th("MMcTrigHeader;");
-	th += i+1;
+        TString th("MMcTrigHeader");
+	if (fNum > 1)
+	  {
+	    th += ";";
+	    th += i+1;
+	  }
 
 	MMcTrigHeader* trighead = (MMcTrigHeader*) pList->FindObject(th);