From a960ae862e3ac788bf50242e7d7b2d3c2d5f0986 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Sun, 2 Oct 2022 20:42:15 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20=E5=9D=97=E5=BC=95=E7=94=A8=E4=B8=8E?=
 =?UTF-8?q?=E6=89=80=E5=BC=95=E7=94=A8=E7=9A=84=E5=86=85=E5=AE=B9=E5=9D=97?=
 =?UTF-8?q?=E8=BF=9B=E8=A1=8C=E4=BA=A4=E6=8D=A2=20https://github.com/siyua?=
 =?UTF-8?q?n-note/siyuan/issues/4981?=
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---
 kernel/model/block.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/model/block.go b/kernel/model/block.go
index 4ea1f9432..70adde70f 100644
--- a/kernel/model/block.go
+++ b/kernel/model/block.go
@@ -96,12 +96,18 @@ func SwapBlockRef(refID, defID string) (err error) {
 		return
 	}
 	refNode := treenode.GetNodeInTree(refTree, refID)
+	if nil == refNode {
+		return
+	}
 	refParentType := refNode.Parent.Type
 	defTree, err := loadTreeByBlockID(defID)
 	if nil != err {
 		return
 	}
 	defNode := treenode.GetNodeInTree(defTree, defID)
+	if nil == defNode {
+		return
+	}
 
 	refPivot := parse.NewParagraph()
 	refNode.InsertBefore(refPivot)