diff --git a/simgear/scene/tsync/terrasync.cxx b/simgear/scene/tsync/terrasync.cxx
index 50c8fbbf..3bc58eea 100644
--- a/simgear/scene/tsync/terrasync.cxx
+++ b/simgear/scene/tsync/terrasync.cxx
@@ -1003,7 +1003,7 @@ void SGTerraSync::WorkerThread::drainWaitingTiles()
 
 //zhongjin 11-14
 
-        if (cacheStatus == SyncItem::Invalid) {
+        if (cacheStatus == SyncItem::Invalid || cacheStatus == SyncItem::NotFound) {
             const auto slot = syncSlotForType(next._type);
             SG_LOG(SG_TERRASYNC, SG_INFO, "adding to _syncSlots slot=" << slot);
             _syncSlots[slot].queue.push_back(next);