Add protection for rate fetcher for VdM scan 2023 runs

Author: fgrosa

PWGMM/Lumi/Tasks/lumiStabilityPP.cxx

@@ -329,7 +329,13 @@ struct LumiStabilityPP {
 
       if (isTriggerTVX) {
         histNBcsVsTime[runNumber]->Fill(timeSinceSOF);
-        histInteractionRate[runNumber]->Fill(mRateFetcher.fetch(ccdb.service, bc.timestamp(), bc.runNumber(), std::string("T0VTX"), true) * 1.e-3); // kHz
+        double rate{-1.};
+        int runVdM23Start{542757};
+        int runVdM23Stop{542768};
+        if (runNumber < runVdM23Start && runNumber > runVdM23Stop) {
+          rate = mRateFetcher.fetch(ccdb.service, bc.timestamp(), bc.runNumber(), std::string("T0VTX"), true) * 1.e-3;  // kHz
+        }
+        histInteractionRate[runNumber]->Fill(rate);
       }
 
       int64_t globalBC = bc.globalBC();