Bulletproof :-)

Common/Visibility.cpp

-// $Id: Visibility.cpp,v 1.3 2003-12-07 00:23:06 geuzaine Exp $
+// $Id: Visibility.cpp,v 1.4 2003-12-07 02:55:46 geuzaine Exp $
 //
 // Copyright (C) 1997-2003 C. Geuzaine, J.-F. Remacle
 //
@@ -502,13 +502,14 @@ List_T *GetVisibilityList(int type)
 
   Tree_Action(Symbol_T, addInNumxSymb);
 
+  if(THEM){
     List_Action(THEM->PhysicalGroups, AddPhysical);
     List_Action(THEM->Partitions, AddPartition);
-
     Tree_Action(THEM->Points, AddVertex);
     Tree_Action(THEM->Curves, AddCurve);
     Tree_Action(THEM->Surfaces, AddSurface);
     Tree_Action(THEM->Volumes, AddVolume);
+  }
 
   List_Sort(ElementaryEntities, CompareEntity);
   List_Sort(PhysicalEntities, CompareEntity);
@@ -565,6 +566,9 @@ void SetVisibilityByNumber(int num, int type, int mode)
   Prism PP, *P, **pP;
   Pyramid QQ, *Q, **pQ;
 
+  if(!THEM)
+    return;
+
   switch (type) {
   case 0:    //node
     vv.Num = num;
@@ -710,6 +714,9 @@ void SetVisibilityByNumber(char *str, int type, int mode)
   Surface *s;
   Volume *V;
 
+  if(!THEM)
+    return;
+
   vmode = mode;
 
   if(!strcmp(str, "all") || !strcmp(str, "*")) {