fix ps cache error print

mindspore/ccsrc/ps/ps_cache/ps_cache_manager.cc

@@ -856,6 +856,7 @@ void PsCacheManager::SyncEmbeddingTable() {
 
 bool PsCacheManager::SyncHostEmbeddingTable() {
   MS_ERROR_IF_NULL(embedding_host_cache_);
+  MS_ERROR_IF_NULL(embedding_host_cache_->host_hash_map_);
   const auto &hash_id_to_index = embedding_host_cache_->host_hash_map_->hash_id_to_index();
   size_t swap_indices_lens = hash_id_to_index.size();
   if (swap_indices_lens == 0) {
@@ -899,6 +900,7 @@ bool PsCacheManager::SyncHostEmbeddingTable() {
 bool PsCacheManager::SyncDeviceEmbeddingTable() {
   MS_ERROR_IF_NULL(embedding_device_cache_);
   const auto &device_hash_map = embedding_device_cache_->device_hash_map_;
+  MS_ERROR_IF_NULL(device_hash_map);
   const auto &hash_id_to_index = device_hash_map->hash_id_to_index();
   size_t swap_indices_lens = hash_id_to_index.size();
   if (swap_indices_lens == 0) {

mindspore/ccsrc/runtime/device/kernel_runtime_manager.cc

@@ -24,7 +24,9 @@ namespace mindspore {
 namespace device {
 void KernelRuntimeManager::ClearRuntimeResource() {
 #if (ENABLE_CPU && (ENABLE_D || ENABLE_GPU))
-  ps::ps_cache_instance.SyncEmbeddingTable();
+  if (ps::PsDataPrefetch::GetInstance().cache_enable()) {
+    ps::ps_cache_instance.SyncEmbeddingTable();
+  }
 #endif
   std::lock_guard<std::mutex> guard(lock_);
   for (auto &iter : runtime_map_) {