Index: /issm/trunk-jpl/src/c/modules/Solverx/SolverxPetsc.cpp
===================================================================
--- /issm/trunk-jpl/src/c/modules/Solverx/SolverxPetsc.cpp	(revision 12854)
+++ /issm/trunk-jpl/src/c/modules/Solverx/SolverxPetsc.cpp	(revision 12855)
@@ -17,5 +17,13 @@
 
 	PetscVec* uf=new PetscVec();
-	SolverxPetsc(&uf->vector, Kff->matrix, pf->vector, uf0->vector, df->vector, parameters);
+
+	Vec uf0_vector = NULL;
+	Vec df_vector  = NULL;
+	
+	if(uf0) uf0_vector = uf0->vector;
+	if(df)  df_vector  = df->vector;
+
+	SolverxPetsc(&uf->vector, Kff->matrix, pf->vector, uf0_vector, df_vector, parameters);
+
 	*puf=uf;