WordPress Multisite Subdomain ERR_TOO_MANY_REDIRECTS

Bad .htaccess file.
After a change to .htaccess everything works fine:

 # BEGIN WordPress
 
 RewriteEngine On
 RewriteBase /
 RewriteRule ^index\.php$ - [L]
 # add a trailing slash to /wp-admin
 RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
 RewriteCond %{REQUEST_FILENAME} -f [OR]
 RewriteCond %{REQUEST_FILENAME} -d
 RewriteRule ^ - [L]
 RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
 RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
 RewriteRule . index.php [L]
 
 # END WordPress