A server error when reordering a structure

[matanlevkowich]

Description

I am getting an error message when trying to reorder a structure by dragging and dropping. The entry does move but but an alert appears saying A server error occurred.

Steps to reproduce

1. Appears under any structure of category group that has the drag and drop option.
2. The bug is only taking place on the live site in both dev/staging/production mode. Local site works fine.

Additional info

• Craft version: Craft Solo 3.6.14
• PHP version: 7.2.34
• Database driver & version: MySQL 5.7.33
• Plugins & versions

Plugin	Version
MobileDetect	1.0.2
Redactor	2.8.7
SEO	3.7.1
Site Switcher	2.2.0

[brandonkelly]

Please clear out your storage/logs folder on the server, reproduce the error, and then search storage/logs/web.log for [error], and paste in the full error, including its stack trace.

[matanlevkowich]

I have discovered that the bug is browser related. Normally I am working with Brave browser and it only happens in it. On other browsers the error doesn't take place so I am not sure if it is really needed to look into the problem. Here is the error from the log file anyhow:

2021-05-18 22:33:58 [-][3][-][error][yii\web\HttpException:403] yii\web\ForbiddenHttpException: User is not authorized to perform this action in /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/web/Controller.php:344
Stack trace:
#0 /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/controllers/StructuresController.php(57): craft\web\Controller->requireAuthorization('editStructure:1')
#1 /usr/www/users/lessmok/julia-k/vendor/yiisoft/yii2/base/Controller.php(179): craft\controllers\StructuresController->beforeAction(Object(yii\base\InlineAction))
#2 /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/web/Controller.php(190): yii\base\Controller->runAction('move-element', Array)
#3 /usr/www/users/lessmok/julia-k/vendor/yiisoft/yii2/base/Module.php(534): craft\web\Controller->runAction('move-element', Array)
#4 /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/web/Application.php(278): yii\base\Module->runAction('structures/move...', Array)
#5 /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/web/Application.php(581): craft\web\Application->runAction('structures/move...', Array)
#6 /usr/www/users/lessmok/julia-k/vendor/craftcms/cms/src/web/Application.php(257): craft\web\Application->_processActionRequest(Object(craft\web\Request))
#7 /usr/www/users/lessmok/julia-k/vendor/yiisoft/yii2/base/Application.php(392): craft\web\Application->handleRequest(Object(craft\web\Request))
#8 /usr/www/users/lessmok/julia-k/web/index.php(22): yii\base\Application->run()
#9 {main}

[brandonkelly]

Ah, this has come up before: #2772

We haven’t gotten to the bottom of it yet, but please read through that and see if any of the comments help.

[ccchapman]

We had this error recently. In our case, sessions and cache were stored in Redis. The sites cache was cleared frequently. If you load the structure, you're authorized to move it at that time. When the cache was cleared, and thus the session permission, you'd be unable to move until you refresh. Our solution was to use separate Redis databases for cache and sessions.