Undefined variable notice from Core in upgraded Perch install

Hi there

Notice: Undefined variable: details in /SITEPATH-REDACTED/perch/core/apps/content/modes/region.options.post.php on line 11

I've just updated a client site to Perch 3.0.8 from 2.xx and I am seeing this php notice in the header for a particular region – in the editing region page. It's a list/detail page setup. If I turn on "edit all on one page" the warning goes away.

I am not seeing this warning on another list/detail page setup on the same site.

Diagnostics

Viewing diagnostic information

 Basic
 Extended
 Add-ons
 Update
Health check

 PHP 7.0.15 is up to date
 MySQL 5.6.35 is up to date
 Image processing available
Summary information

Perch: 3.0.8, PHP: 7.0.15, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: b5c5906d452ec590732a93b051f3827e02749b83 $, with PDO
Server OS: Darwin, apache2handler
Installed apps: content (3.0.8), assets (3.0.8), categories (3.0.8)
App runtimes: <?php $apps_list = [ ];
PERCH_LOGINPATH: /perch
PERCH_PATH: /Users/ellimondo/Dropbox/Sites/absolutesg/dev.absolutesg.co.uk/perch
PERCH_CORE: /Users/ellimondo/Dropbox/Sites/absolutesg/dev.absolutesg.co.uk/perch/core
PERCH_RESFILEPATH: /Users/ellimondo/Dropbox/Sites/absolutesg/dev.absolutesg.co.uk/perch/resources
Image manipulation: GD
PHP limits: Max upload 32M, Max POST 32M, Memory: 128M, Total max file upload: 32M
F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
Resource folder writeable: Yes
HTTP_HOST: dev.absolutesg.co.uk
DOCUMENT_ROOT: /Users/ellimondo/Dropbox/Sites/absolutesg/dev.absolutesg.co.uk
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

Debug message

Debug Message - Perch 3.0.8
[1] SELECT u.*, r.* FROM perch2_users u, perch2_user_roles r WHERE u.roleID=r.roleID AND u.userEnabled=1 AND u.userID=1 AND u.userHash='46bf2ae4bf48e7fc167757e06a6d0494' LIMIT 1
UPDATE perch2_users SET userHash='3056dfe9403be0942412f8abf15f483f' WHERE userID='1'
[28] SELECT p.privKey FROM perch2_user_privileges p
[21] SELECT settingID, settingValue, userID FROM perch2_settings WHERE userID=1 OR userID=0 ORDER BY userID ASC
[6] SELECT itemValue FROM perch2_menu_items WHERE itemType='app'
[1] SELECT * FROM perch2_content_regions WHERE regionID=19 LIMIT 1
[1] SELECT * FROM perch2_pages WHERE pageID=7 LIMIT 1
Using template: /templates/content/project_content_detail.html
[11] SELECT SQL_CALC_FOUND_ROWS DISTINCT * FROM perch2_content_items c WHERE c.regionID=19 AND c.itemRev=114 ORDER BY c.itemOrder ASC
[1] SELECT * FROM perch2_menu_items WHERE itemActive=1 AND itemType='menu' AND parentID=0 ORDER BY itemOrder ASC LIMIT 0, 1
[1] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=1 ORDER BY mi.itemOrder ASC
[1] SELECT itemTitle FROM perch2_menu_items WHERE itemType='app' AND itemValue='content' LIMIT 1
[1] SELECT * FROM perch2_menu_items WHERE itemActive=1 AND itemType='menu' AND parentID=0 ORDER BY itemOrder ASC LIMIT 1, 10
[2] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=2 ORDER BY mi.itemOrder ASC
File: /core/apps/content/modes/region.itemlist.post.php
Mode: region.itemlist
Queries: 14
Memory: 3.2746
Array
(
    [type] => 8
    [message] => Undefined variable: details
    [file] => /Users/ellimondo/Dropbox/Sites/absolutesg/dev.absolutesg.co.uk/perch/core/apps/content/modes/region.itemlist.post.php
    [line] => 11
)