From 3bb4429f1519219404404b28014d550b01cf7d22 Mon Sep 17 00:00:00 2001
From: attoae <55045456+attoae@users.noreply.github.com>
Date: Mon, 23 Sep 2024 19:01:32 +0800
Subject: [PATCH] fix: The returned value queried is not necessarily BlockBlot

---
 packages/quill/src/blots/scroll.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/quill/src/blots/scroll.ts b/packages/quill/src/blots/scroll.ts
index 9975e12831..146c8f4e0a 100644
--- a/packages/quill/src/blots/scroll.ts
+++ b/packages/quill/src/blots/scroll.ts
@@ -1,4 +1,10 @@
-import { ContainerBlot, LeafBlot, Scope, ScrollBlot } from 'parchment';
+import {
+  BlockBlot,
+  ContainerBlot,
+  LeafBlot,
+  Scope,
+  ScrollBlot
+} from 'parchment';
 import type { Blot, Parent, EmbedBlot, ParentBlot, Registry } from 'parchment';
 import Delta, { AttributeMap, Op } from 'quill-delta';
 import Emitter from '../core/emitter.js';
@@ -381,7 +387,8 @@ class Scroll extends ScrollBlot {
     const formats: AttributeMap = {};
 
     Object.entries(attributes).forEach(([key, value]) => {
-      const isBlockBlot = this.query(key, Scope.BLOCK & Scope.BLOT) != null;
+      const match = this.query(key, Scope.BLOCK & Scope.BLOT);
+      const isBlockBlot = match != null && match.prototype instanceof BlockBlot;
       if (isBlockBlot) {
         blotName = key;
       } else {