[*] caught async crash on shutdown

Source/Async/GroupState.cpp

@@ -43,11 +43,21 @@ namespace Aurora::Async
     {
         AU_LOCK_GUARD(this->workersMutex);
 
-        for (const auto &worker : this->workers)
+        for (const auto &[id, pWorker] : this->workers)
         {
-            AuAtomicAdd(&worker.second->cvHasWork, 1u);
-            worker.second->cvVariable->Broadcast();
-            worker.second->eventLs->Set();
+            if (!pWorker)
+            {
+                continue;
+            }
+
+            AuAtomicAdd(&pWorker->cvHasWork, 1u);
+
+            pWorker->cvVariable->Broadcast();
+
+            if (auto pEventLS = pWorker->eventLs)
+            {
+                pEventLS->Set();
+            }
         }
     }