Additional protection

diff --git a/PYTHIA6/AliPythia.cxx b/PYTHIA6/AliPythia.cxx
index 9173c056a66f04a4b56d8566ac17ec5194b70794..282f2bd05c10a86dd1f31313eb5138a3fb2aeb36 100644 (file)
--- a/PYTHIA6/AliPythia.cxx
+++ b/PYTHIA6/AliPythia.cxx
@@ -961,9 +961,13 @@ void  AliPythia::Quench()
                    //
                    //     Calculate new px, py
                    //
-                   Double_t pxNew   = jtNew / jt * pxs;
-                   Double_t pyNew   = jtNew / jt * pys;        
+                   Double_t pxNew   = 0;
+                   Double_t pyNew   = 0;
                    
+                   if (jt>0) {
+                     jtNew / jt * pxs;
+                     jtNew / jt * pys;
+                   }   
 //                 Double_t dpx = pxs - pxNew;
 //                 Double_t dpy = pys - pyNew;
 //                 Double_t dpz = pl  - plNew;