From ff664f1262a2e9c2ff3342ff3b25f527bb8960f8 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Sun, 11 Dec 2022 11:35:39 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20=E6=94=AF=E6=8C=81=E5=90=88=E5=B9=B6?=
 =?UTF-8?q?=E5=AD=90=E6=96=87=E6=A1=A3=E5=AF=BC=E5=87=BA=20Word/PDF=20http?=
 =?UTF-8?q?s://github.com/siyuan-note/siyuan/issues/3219?=
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---
 kernel/model/export_merge.go | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/model/export_merge.go b/kernel/model/export_merge.go
index 2bab6eea1..1dcde9428 100644
--- a/kernel/model/export_merge.go
+++ b/kernel/model/export_merge.go
@@ -29,12 +29,15 @@ func mergeSubDocs(rootTree *parse.Tree) (ret *parse.Tree, err error) {
 	}
 
 	insertPoint := rootTree.Root.LastChild
+	if nil == insertPoint {
+		insertPoint = rootTree.Root
+	}
+
 	for {
 		i := 0
 		if err = walkBlock(insertPoint, rootBlock, i); nil != err {
 			return
 		}
-
 		if nil == rootBlock.Children {
 			break
 		}
@@ -44,13 +47,12 @@ func mergeSubDocs(rootTree *parse.Tree) (ret *parse.Tree, err error) {
 
 func walkBlock(insertPoint *ast.Node, block *Block, level int) (err error) {
 	level++
-	for _, c := range block.Children {
+	for i := len(block.Children) - 1; i >= 0; i-- {
+		c := block.Children[i]
 		if err = walkBlock(insertPoint, c, level); nil != err {
 			return
 		}
-	}
 
-	for _, c := range block.Children {
 		nodes, loadErr := loadTreeNodes(c.Box, c.Path, level)
 		if nil != loadErr {
 			return