diff --git a/src/adapter/driver/cache.c b/src/adapter/driver/cache.c
index aec580286..6e2829db7 100644
--- a/src/adapter/driver/cache.c
+++ b/src/adapter/driver/cache.c
@@ -772,7 +772,7 @@ void neu_driver_cache_update_change(neu_driver_cache_t *cache,
         }
         elem->value.type = value.type;
 
-        if (metas != NULL) {
+        if (metas != NULL && n_meta != 0) {
             if (elem->metas != NULL) {
                 free(elem->metas);
             }
diff --git a/src/adapter/driver/driver.c b/src/adapter/driver/driver.c
index 482c3ce67..28a5b38cc 100644
--- a/src/adapter/driver/driver.c
+++ b/src/adapter/driver/driver.c
@@ -375,6 +375,13 @@ static void update_im(neu_adapter_t *adapter, const char *group,
                 } else {
                     neu_free_dvalue(&tag_value->value);
                 }
+
+                if (tag_value->metas != NULL) {
+                    for (int i = 0; i < tag_value->n_meta; i++) {
+                        neu_free_dvalue(&tag_value->metas[i].value);
+                    }
+                    free(tag_value->metas);
+                }
             }
             utarray_free(data->tags);
             free(data->group);