diff --git a/NPLib/Tigress/TTigressPhysics.cxx b/NPLib/Tigress/TTigressPhysics.cxx
index 7bed45f0c1c5eb02caf56ee8251efd1a53238690..3f10724154290db907f11e89f59d429553ae96f8 100644
--- a/NPLib/Tigress/TTigressPhysics.cxx
+++ b/NPLib/Tigress/TTigressPhysics.cxx
@@ -74,6 +74,9 @@ void TTigressPhysics::BuildPhysicalEvent(){
 }
 /////////////////////////////////////////////////
 TVector3 TTigressPhysics::GetPositionOfInteraction(int i){
+   TVector3 dummy;
+
+   return dummy;
 }
 /////////////////////////////////////////////////
 void TTigressPhysics::PreTreat(){