From 0a569f872c09a4dee54ca07ef765927e4d558b6a Mon Sep 17 00:00:00 2001
From: Mufanc <47652878+Mufanc@users.noreply.github.com>
Date: Wed, 15 Dec 2021 16:33:17 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=BC=E4=B9=8E=E4=BF=AE=E5=A4=8D=E3=80=8CKe?=
 =?UTF-8?q?yError:=20courseId=E3=80=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 automaton/devtools.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/automaton/devtools.py b/automaton/devtools.py
index 1b62163..86fe222 100644
--- a/automaton/devtools.py
+++ b/automaton/devtools.py
@@ -64,6 +64,8 @@ class Browser(object):
             pages = (await client.get(f'http://127.0.0.1:{self.port}/json')).json()
             for page in pages:
                 params = dict(parser.parse_qsl(parser.urlsplit(page['url']).query))
+                if 'courseId' not in params:
+                    continue
                 if 'bookId' in params:
                     return params['courseId'], params['bookId']
                 return params['courseId'], None