ThinkCMF后台错误：Trying to access array offset on value of type null --- name="cmf_settings[banned_usern

PHP版本 7.4.1

ThinkCMF版本 v5.1.39 LTS (如何查看CMF版本：cd /path/to/project/; php think version)

OSX 10.14.4

解决办法

修改 /public/themes/admin_simpleboot3/admin/setting/site.html

从

name="cmf_settings[banned_usernames]">{$cmf_settings.banned_usernames}

到

name="cmf_settings[banned_usernames]">if(isset($cmf_settings['banned_usernames'])){ echo $cmf_settings['banned_usernames']; }

Trying to access array offset on value of type null

<textarea class="form-control" id="input-banned_usernames"
name="cmf_settings[banned_usernames]"><?php echo $cmf_settings['banned_usernames']; ?></textarea>