check for null

Author: baltzell

reconstruction/dc/src/main/java/org/jlab/rec/dc/track/TrackCandListFinder.java

@@ -1103,13 +1103,15 @@ private List<Track> findCurvedTracks(CrossList crossList, DCGeant4Factory DcDete
                                         trjFind, fitStateVec,
                                         fitStateVec.getZ(),
                                         DcDetector, dcSwim);
+
+                                Point3D vtx = cand.get_Vtx0();
+                                if (vtx != null) {
+                                    Point3D VTCS = cand.get(cand.size()-1).getCoordsInTiltedSector(cand.get_Vtx0().x(), cand.get_Vtx0().y(), cand.get_Vtx0().z());
+                                    double deltaPathToVtx =  kFZRef.getDeltaPathToVtx(cand.get(cand.size()-1).get_Sector(), VTCS.z());
 
-                                Point3D VTCS = cand.get(cand.size()-1).getCoordsInTiltedSector(cand.get_Vtx0().x(), cand.get_Vtx0().y(), cand.get_Vtx0().z());
-                                double deltaPathToVtx =  kFZRef.getDeltaPathToVtx(cand.get(cand.size()-1).get_Sector(), VTCS.z());
-                                
-                                List<org.jlab.rec.dc.trajectory.StateVec> kfStateVecsAlongTrajectory = setKFStateVecsAlongTrajectory(kFZRef, deltaPathToVtx);
-                                cand.setStateVecs(kfStateVecsAlongTrajectory);                                  
-                                
+                                    List<org.jlab.rec.dc.trajectory.StateVec> kfStateVecsAlongTrajectory = setKFStateVecsAlongTrajectory(kFZRef, deltaPathToVtx);
+                                    cand.setStateVecs(kfStateVecsAlongTrajectory);
+                                }
                                 // add candidate to list of tracks
                                 if (cand.fit_Successful = true) {
                                     cands.add(cand);