do not savestats in dualmode

system.cpp

@@ -837,6 +837,7 @@ void saveStats(bool emergency = false) {
   if(tour::on) return;
   #endif
   if(randomPatternsMode) return;
+  if(dual::state) return;
   if(archimedean) return;
   if(daily::on) return;
   if(peace::on) return;