Index: /trunk/BNC/src/PPP/pppClient.cpp
===================================================================
--- /trunk/BNC/src/PPP/pppClient.cpp	(revision 5830)
+++ /trunk/BNC/src/PPP/pppClient.cpp	(revision 5831)
@@ -386,5 +386,7 @@
   while (it != obsVector.end()) {
     t_pppSatObs* satObs = *it;
-    satObs->cmpModel(station);
+    if (satObs->isValid()) {
+      satObs->cmpModel(station);
+    }
     if (satObs->isValid() && satObs->eleSat() >= OPT->_minEle) {
       ++it;