Error: Undefined offset: 3 at /home/www/wwwroot/www.yc18.top/lib/private/legacy/OC_Helper.php#548

Nextcloud version (20.0.1 ):
Operating system and version ( CentOS Linux 7):
Apache or nginx version ( Apache 2.4.25):
PHP version (7.3):

The issue you are facing:

The output of your Nextcloud log in Admin > Logging:

{"reqId":"KUcK5TQOJhi6zJOOpKnp","level":3,"time":"2020-11-04T06:22:48+00:00","remoteAddr":"144.52.134.28","user":"Admin","app":"PHP","method":"GET","url":"/index.php/apps/files/","message":{"Exception":"Error","Message":"Undefined offset: 3 at /home/www/wwwroot/www.yc18.top/lib/private/legacy/OC_Helper.php#548","Code":0,"Trace":[{"file":"/home/www/wwwroot/www.yc18.top/lib/private/legacy/OC_Helper.php","line":548,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::","args":[8,"Undefined offset: 3","/home/www/wwwroot/www.yc18.top/lib/private/legacy/OC_Helper.php",548,{"path":"/","rootInfo":{"__class__":"OC\\Files\\FileInfo"},"includeExtStorage":false,"used":387788070,"quota":-3,"mount":{"__class__":"OC\\Files\\Mount\\MountPoint"},"storage":{"cache":null,"scanner":{"__class__":"OC\\Files\\Cache\\Scanner"},"watcher":null,"propagator":null,"updater":null,"__class__":"OCA\\Files_Trashbin\\Storage"},"sourceStorage":{"cache":null,"scanner":{"__class__":"OC\\Files\\Cache\\Scanner"},"watcher":null,"propagator":null,"updater":null,"__class__":"OCA\\Files_Trashbin\\Storage"},"free":169337729024,"total":169725517094,"relative":0.23,"ownerId":"Admin","ownerDisplayName":"Admin","owner":{"__class__":"OC\\User\\User"}}]},{"file":"/home/www/wwwroot/www.yc18.top/apps/files/lib/Controller/ViewController.php","line":139,"function":"getStorageInfo","class":"OC_Helper","type":"::","args":["/",{"__class__":"OC\\Files\\FileInfo"}]},{"file":"/home/www/wwwroot/www.yc18.top/apps/files/lib/Controller/ViewController.php","line":187,"function":"getStorageInfo","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":[]},{"file":"/home/www/wwwroot/www.yc18.top/lib/private/AppFramework/Http/Dispatcher.php","line":169,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->","args":["","",null,false]},{"file":"/home/www/wwwroot/www.yc18.top/lib/private/AppFramework/Http/Dispatcher.php","line":100,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/home/www/wwwroot/www.yc18.top/lib/private/AppFramework/App.php","line":152,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->","args":[{"__class__":"OCA\\Files\\Controller\\ViewController"},"index"]},{"file":"/home/www/wwwroot/www.yc18.top/lib/private/Route/Router.php","line":308,"function":"main","class":"OC\\AppFramework\\App","type":"::","args":["OCA\\Files\\Controller\\ViewController","index",{"__class__":"OC\\AppFramework\\DependencyInjection\\DIContainer"},{"action":null,"_route":"files.view.index"}]},{"file":"/home/www/wwwroot/www.yc18.top/lib/base.php","line":1009,"function":"match","class":"OC\\Route\\Router","type":"->","args":["/apps/files/"]},{"file":"/home/www/wwwroot/www.yc18.top/index.php","line":37,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/home/www/wwwroot/www.yc18.top/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36 Edg/86.0.622.61","version":"20.0.1.1","id":"5fa249e122001"}

How can I solve it?

Please use the search function of this forum to find the answer on your question first, before addressing the same issue again and again. This problem has already been discussed in detail, a reference to an existing issue ticket has been posted which also includes a fix for the problem.