diff --git a/EventFilter/Utilities/src/FastMonitoringService.cc b/EventFilter/Utilities/src/FastMonitoringService.cc
index 01f347960bf4e..5d90ec9e5dd42 100644
--- a/EventFilter/Utilities/src/FastMonitoringService.cc
+++ b/EventFilter/Utilities/src/FastMonitoringService.cc
@@ -651,14 +651,20 @@ namespace evf {
     microstate_[getSID(sid)] = getmInput();
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = getmInput();
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = getmInput();
   }
 
   void FastMonitoringService::postSourceEvent(edm::StreamID sid) {
     microstate_[getSID(sid)] = getmFwkOvhSrc();
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = getmIdle();
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = getmIdle();
   }
 
   void FastMonitoringService::preModuleEventAcquire(edm::StreamContext const& sc,
@@ -667,8 +673,11 @@ namespace evf {
     microstateAcqFlag_[getSID(sc)] = 1;
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = (void*)(mcc.moduleDescription());
-    tmicrostateAcqFlag_[getTID()] = 1;
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = (void*)(mcc.moduleDescription());
+    tmicrostateAcqFlag_[tid] = 1;
   }
 
   void FastMonitoringService::postModuleEventAcquire(edm::StreamContext const& sc,
@@ -677,22 +686,31 @@ namespace evf {
     microstateAcqFlag_[getSID(sc)] = 0;
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = getmIdle();
-    tmicrostateAcqFlag_[getTID()] = 0;
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = getmIdle();
+    tmicrostateAcqFlag_[tid] = 0;
   }
 
   void FastMonitoringService::preModuleEvent(edm::StreamContext const& sc, edm::ModuleCallingContext const& mcc) {
     microstate_[getSID(sc)] = (void*)(mcc.moduleDescription());
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = (void*)(mcc.moduleDescription());
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = (void*)(mcc.moduleDescription());
   }
 
   void FastMonitoringService::postModuleEvent(edm::StreamContext const& sc, edm::ModuleCallingContext const& mcc) {
     microstate_[getSID(sc)] = getmFwkOvhMod();
     if (!tbbMonitoringMode_)
       return;
-    tmicrostate_[getTID()] = getmIdle();
+    auto tid = getTID();
+    if (tid >= nThreads_)
+      return;
+    tmicrostate_[tid] = getmIdle();
   }
 
   //from source