diff --git a/PWGEM/Dilepton/TableProducer/skimmerOTS.cxx b/PWGEM/Dilepton/TableProducer/skimmerOTS.cxx
index b37ae9d8dc6..8a1ab8bdf64 100644
--- a/PWGEM/Dilepton/TableProducer/skimmerOTS.cxx
+++ b/PWGEM/Dilepton/TableProducer/skimmerOTS.cxx
@@ -33,6 +33,8 @@ using namespace o2::framework;
 using namespace o2::framework::expressions;
 using namespace o2::soa;
 
+using MyCollisions = soa::Join<aod::Collisions, aod::EMEvSels>;
+
 struct skimmerOTS {
   Produces<o2::aod::EMSWTriggerInfosTMP> swtinfo_tmp; // Join aod::Collision later.
   Produces<o2::aod::EMSWTriggerBitsTMP> swtbit_tmp;
@@ -130,7 +132,7 @@ struct skimmerOTS {
     mRunNumber = bc.runNumber();
   }
 
-  void process(aod::Collisions const& collisions, aod::BCsWithTimestamps const&)
+  void process(MyCollisions const& collisions, aod::BCsWithTimestamps const&)
   {
     for (const auto& collision : collisions) {
       auto bc = collision.template bc_as<aod::BCsWithTimestamps>(); // don't use foundBC.
@@ -141,35 +143,37 @@ struct skimmerOTS {
       // uint16_t analyzedToI_bitmap = 0;
       registry.fill(HIST("hCollisionCounter"), 1); // all
 
-      if (zorro.isSelected(bc.globalBC(), bcMarginForSoftwareTrigger)) { // triggered event
-        auto swt_bitset = zorro.getLastResult();                         // this has to be called after zorro::isSelected, or simply call zorro.fetch
-        auto TOIcounters = zorro.getTOIcounters();                       // this has to be called after zorro::isSelected, or simply call zorro.fetch
-        auto ATcounters = zorro.getATcounters();                         // this has to be called after zorro::isSelected, or simply call zorro.fetch
-
-        // LOGF(info, "swt_bitset.to_string().c_str() = %s", swt_bitset.to_string().c_str());
-        for (size_t idx = 0; idx < mTOIidx.size(); idx++) {
-          if (swt_bitset.test(mTOIidx[idx])) {
-            auto swtname = swt_names[idx];
-            int emswtId = o2::aod::pwgem::dilepton::swt::aliasLabels.at(swtname);
-            trigger_bitmap |= BIT(emswtId);
-            // LOGF(info, "swtname = %s is fired. swt index in original swt table = %d, swt index for EM table = %d", swtname.data(), mTOIidx[idx], o2::aod::pwgem::dilepton::swt::aliasLabels.at(swtname));
-            registry.fill(HIST("hCollisionCounter"), idx + 2); // fired trigger
-
-            // LOGF(info, "ATcounters[mTOIidx[idx]] = %d, TOIcounters[idx] = %d", ATcounters[mTOIidx[idx]], TOIcounters[idx]);
-
-            while (ATcounters[mTOIidx[idx]] > mATCounters[emswtId]) {
-              mATCounters[emswtId]++;
-              swtcounterAT_tmp(BIT(emswtId));
-            }
-
-            while (TOIcounters[idx] > mTOICounters[emswtId]) {
-              mTOICounters[emswtId]++; // always incremented by 1 in zorro!!
-              swtcounterTOI_tmp(BIT(emswtId));
+      if (collision.isSelected()) {
+
+        if (zorro.isSelected(bc.globalBC(), bcMarginForSoftwareTrigger)) { // triggered event
+          auto swt_bitset = zorro.getLastResult();                         // this has to be called after zorro::isSelected, or simply call zorro.fetch
+          auto TOIcounters = zorro.getTOIcounters();                       // this has to be called after zorro::isSelected, or simply call zorro.fetch
+          auto ATcounters = zorro.getATcounters();                         // this has to be called after zorro::isSelected, or simply call zorro.fetch
+
+          // LOGF(info, "swt_bitset.to_string().c_str() = %s", swt_bitset.to_string().c_str());
+          for (size_t idx = 0; idx < mTOIidx.size(); idx++) {
+            if (swt_bitset.test(mTOIidx[idx])) {
+              auto swtname = swt_names[idx];
+              int emswtId = o2::aod::pwgem::dilepton::swt::aliasLabels.at(swtname);
+              trigger_bitmap |= BIT(emswtId);
+              // LOGF(info, "swtname = %s is fired. swt index in original swt table = %d, swt index for EM table = %d", swtname.data(), mTOIidx[idx], o2::aod::pwgem::dilepton::swt::aliasLabels.at(swtname));
+              registry.fill(HIST("hCollisionCounter"), idx + 2); // fired trigger
+
+              // LOGF(info, "ATcounters[mTOIidx[idx]] = %d, TOIcounters[idx] = %d", ATcounters[mTOIidx[idx]], TOIcounters[idx]);
+
+              while (ATcounters[mTOIidx[idx]] > mATCounters[emswtId]) {
+                mATCounters[emswtId]++;
+                swtcounterAT_tmp(BIT(emswtId));
+              }
+
+              while (TOIcounters[idx] > mTOICounters[emswtId]) {
+                mTOICounters[emswtId]++; // always incremented by 1 in zorro!!
+                swtcounterTOI_tmp(BIT(emswtId));
+              }
+              // LOGF(info, "collision.globalIndex() = %d, bc.globalBC() = %llu, mTOICounters[%d] = %d, mATcounters[%d] = %d", collision.globalIndex(), bc.globalBC(), emswtId, mTOICounters[emswtId], emswtId, mATCounters[emswtId]);
             }
-
-            // LOGF(info, "collision.globalIndex() = %d, bc.globalBC() = %llu, mTOICounters[%d] = %d, mATcounters[%d] = %d", collision.globalIndex(), bc.globalBC(), emswtId, mTOICounters[emswtId], emswtId, mATCounters[emswtId]);
-          }
-        } // end of TOI loop
+          } // end of TOI loop
+        }
       }
       swtbit_tmp(trigger_bitmap);
     } // end of collision loop