add some missing pointer checks

src/ASM/ASMs3DLag.C

@@ -851,7 +851,7 @@ int ASMs3DLag::evalPoint (const double* xi, double* param, Vec3& X) const
       param[d] = (1.0-xi[d])*svol->startparam(d) + xi[d]*svol->endparam(d);
     else
       param[d] = xi[d];
-    if (!this->getGridParameters(u[d],d,svol->order(d)-1)) return -3;
+    if (svol && !this->getGridParameters(u[d],d,svol->order(d)-1)) return -3;
   }
 
   // Search for the closest node

src/SIM/SIMinput.C

@@ -1125,7 +1125,7 @@ bool SIMinput::refine (const LR::RefineData& prm,
     }
 
   // Single patch models only pass refinement call to the ASM level
-  if (myModel.size() == 1)
+  if (myModel.size() == 1 && pch)
     return (isRefined = pch->refine(prm,sol,fName));
 
   if (!prm.errors.empty()) // refinement by true_beta

src/Utility/Functions.C

@@ -67,7 +67,10 @@ Real SineFunc::deriv (Real x) const
 Real ConstTimeFunc::evaluate (const Vec3& X) const
 {
   const Vec4* Xt = dynamic_cast<const Vec4*>(&X);
-  return (*tfunc)(Xt ? Xt->t : Real(0));
+  if (Xt)
+    return (*tfunc)(Xt->t);
+  else
+    return (*tfunc)(Real(0));
 }