diff --git a/src/ParamGetImpl/DDServerInterface/VirtualInstrumentInterval.cc b/src/ParamGetImpl/DDServerInterface/VirtualInstrumentInterval.cc
index 52eba45..4cdac4e 100644
--- a/src/ParamGetImpl/DDServerInterface/VirtualInstrumentInterval.cc
+++ b/src/ParamGetImpl/DDServerInterface/VirtualInstrumentInterval.cc
@@ -166,6 +166,10 @@ namespace AMDA {
 		unsigned int VirtualInstrumentInterval::writeNoData() {
 			LOG4CXX_INFO(gLogger, "VirtualInstrumentInterval::writeNoData - " << _paramNameListForLog);
 
+            if (_currentTimeIntToProcess == _timeIntervalList.end()) {
+                return writeEmptyData();
+            }
+
 			double crtStartTime = _currentTimeIntToProcess->_startTime;
 			double crtStopTime = _currentTimeIntToProcess->_stopTime;
 
--
libgit2 0.21.2