Protection against division by 0.

diff --git a/PYTHIA6/AliGenPythia.cxx b/PYTHIA6/AliGenPythia.cxx
index 93cdb30fa2ae31e0883dedad3d03ac9c129f0738..c73145bbc05de3308010f2b7e10fb1f6d245d1eb 100644 (file)
--- a/PYTHIA6/AliGenPythia.cxx
+++ b/PYTHIA6/AliGenPythia.cxx
@@ -677,13 +677,15 @@ void AliGenPythia::FinishRun()
 {
 // Print x-section summary
     fPythia->Pystat(1);
-    fQ  /= fNev;
-    fX1 /= fNev;
-    fX2 /= fNev;    
+
+    if (fNev > 0.) {
+       fQ  /= fNev;
+       fX1 /= fNev;
+       fX2 /= fNev;    
+    }
+    
     printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
     printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
-    
-
 }
 
 void AliGenPythia::AdjustWeights()