Index: trunk/BNC/src/PPP/pppThread.cpp
===================================================================
--- trunk/BNC/src/PPP/pppThread.cpp	(revision 5791)
+++ trunk/BNC/src/PPP/pppThread.cpp	(revision 5792)
@@ -189,5 +189,5 @@
     }
     if (epoData == 0) {
-      if (newObs->_time > _pppEpochs.back()->_time) {
+      if (_pppEpochs.empty() || newObs->_time > _pppEpochs.back()->_time) {
         epoData = new t_pppEpoData;
         epoData->_time = newObs->_time;