Index: trunk/BNC/src/bncgetthread.cpp
===================================================================
--- trunk/BNC/src/bncgetthread.cpp	(revision 6752)
+++ trunk/BNC/src/bncgetthread.cpp	(revision 6753)
@@ -826,5 +826,5 @@
         if (_manualNMEASampl) {
           int dt = _lastManualNMEA.secsTo(QDateTime::currentDateTime());
-          if (fmod(double(dt), double(_manualNMEASampl)) == 0.0) {
+          if (dt && (fmod(double(dt), double(_manualNMEASampl)) == 0.0)) {
             _query->sendNMEA(_manualNMEAString);
             _lastManualNMEA = QDateTime::currentDateTime();