I use WordPress 4.9.1 with the theme Newsmag. I tried to install some additional plugins, like bbPress and Media Library Folders. These are popular and common plugins, but after installation, I got error HTTP 500 on administration panel. I have to disable all the installed plugins in SQL database to recover site. There are several plugins, that are installed and enabled without this error, just like Akeeba Backup.
The simplest way to disable a plugin when there is no access to admin, is renaming of plugin folder.
Connect via ftp by Filezilla, for example. Find plugin folder and put dot before its folder name. This should look like
Such folder names are ignored by WordPress. Update the admin page and you will see that bbpress is removed from the plugin list.