Add an assert to detect possible nullptr dereference

components/detournavigator/asyncnavmeshupdater.cpp

@@ -511,6 +511,8 @@ namespace DetourNavigator
         const auto offMeshConnections = mOffMeshConnectionsManager.get().get(job.mChangedTile);
 
         const PreparedNavMeshData* preparedNavMeshDataPtr = cachedNavMeshData ? &cachedNavMeshData.get() : preparedNavMeshData.get();
+        assert (preparedNavMeshDataPtr != nullptr);
+
         const UpdateNavMeshStatus status = navMeshCacheItem.lock()->updateTile(job.mChangedTile, std::move(cachedNavMeshData),
             makeNavMeshTileData(*preparedNavMeshDataPtr, offMeshConnections, job.mAgentBounds, job.mChangedTile, mSettings.get().mRecast));