FIX

Signed-off-by: Felix Schlepper <felix.schlepper@cern.ch>

Author: f3sch

Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx

@@ -331,7 +331,12 @@ void ITSTrackingInterface::run(framework::ProcessingContext& pc)
       const int iSrc = 0; // take only events from collision generator
       const auto eveId2colId = dc->getCollisionIndicesForSource(iSrc);
       for (int iEve{0}; iEve < mcReader.getNEvents(iSrc); ++iEve) {
-        const auto& ir = irs[eveId2colId[iEve]];
+        const auto colId = eveId2colId.find(iEve);
+        if (colId == eveId2colId.end()) {
+          mcReader.releaseTracksForSourceAndEvent(iSrc, iEve);
+          continue;
+        }
+        const auto& ir = irs[colId->second];
         if (!ir.isDummy()) {
           const auto bc = (ir - irFirstTF).toLong() - roFrameBiasInBC;
           if (bc >= 0 && upcPassRanForBC(bc)) {