do not use [] access for grantTimers and unitRegTimers, use find() lookups these are safer;

src/common/lookups/AffiliationLookup.cpp

@@ -672,11 +672,14 @@ void AffiliationLookup::clock(uint32_t ms)
     for (auto entry : m_grantChTable) {
         uint32_t dstId = entry.first;
 
-        m_grantTimers[dstId].clock(ms);
-        if (m_grantTimers[dstId].isRunning() && m_grantTimers[dstId].hasExpired()) {
+        auto it = m_grantTimers.find(dstId);
+        if (it != m_grantTimers.end()) {
+            it->second.clock(ms);
+            if (it->second.isRunning() && it->second.hasExpired()) {
                 gntsToRel.push_back(dstId);
             }
         }
+    }
     m_grantChTable.unlock();
 
     // release grants that have timed out
@@ -691,11 +694,14 @@ void AffiliationLookup::clock(uint32_t ms)
         m_unitRegTable.lock(false);
         std::vector<uint32_t> unitsToDereg = std::vector<uint32_t>();
         for (uint32_t srcId : m_unitRegTable) {
-            m_unitRegTimers[srcId].clock(ms);
-            if (m_unitRegTimers[srcId].isRunning() && m_unitRegTimers[srcId].hasExpired()) {
+            auto it = m_unitRegTimers.find(srcId);
+            if (it != m_unitRegTimers.end()) {
+                it->second.clock(ms);
+                if (it->second.isRunning() && it->second.hasExpired()) {
                     unitsToDereg.push_back(srcId);
                 }
             }
+        }
         m_unitRegTable.unlock();
 
         // release units registrations that have timed out