fix serialization

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ConfigMTree.java

diff --git a/iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ConfigMTree.java b/iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ConfigMTree.java
index 6252fff..27b8e26 100644
--- a/iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ConfigMTree.java
+++ b/iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/ConfigMTree.java
@@ -804,7 +804,7 @@
       if (child.isDatabase()) {
         serializeDatabaseNode(child.getAsDatabaseMNode(), outputStream);
       } else if (child instanceof ConfigTableNode) {
-        serializeTableNode((ConfigTableNode) node, outputStream);
+        serializeTableNode((ConfigTableNode) child, outputStream);
       } else {
         serializeConfigBasicMNode(child, outputStream);
       }