diff --git a/src/share/schema/ob_table_schema.cpp b/src/share/schema/ob_table_schema.cpp
index 42f87fbdfe..f71efc296d 100644
--- a/src/share/schema/ob_table_schema.cpp
+++ b/src/share/schema/ob_table_schema.cpp
@@ -7988,7 +7988,12 @@ int ObColumnIterByPrevNextID::next(const ObColumnSchemaV2 *&column_schema)
     }
   } else {
     if (OB_ISNULL(last_column_schema_)) {
-      column_schema = get_first_column();
+      if (table_schema_.is_sys_view() && 0 == table_schema_.get_column_count()) {
+        is_end_ = true;
+        ret = OB_ITER_END;
+      } else {
+        column_schema = get_first_column();
+      }
     } else if (BORDER_COLUMN_ID == last_column_schema_->get_next_column_id()) {
       is_end_ = true;
       ret = OB_ITER_END;
diff --git a/src/sql/resolver/ddl/ob_alter_table_resolver.cpp b/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
index 605f43038a..6b4edebc62 100644
--- a/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
+++ b/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
@@ -272,6 +272,8 @@ int ObAlterTableResolver::resolve(const ParseNode &parse_tree)
             if (OB_FAIL(ret)) {
             } else if (OB_FAIL(schema_guard->get_database_id(alter_table_stmt->get_tenant_id(), database_name, database_id))) {
               LOG_WARN("fail to get database id", K(ret), K(alter_table_stmt->get_tenant_id()), K(database_name));
+            } else if (OB_INVALID_ID == database_id) {
+              // do nothing
             } else if (OB_FAIL(schema_checker_->get_mock_fk_parent_table_with_name(
                 session_info_->get_effective_tenant_id(), database_id,
                 new_table_name, mock_parent_table_schema))) {