Can't login due to Php error (Unsupported operand types: null & string)

lmatias Suddenly, ...

Check if your DokuWiki is compatible with the PHP version you are running. Maybe the provider has set the PHP version to 8.x?

lmatias TypeError: Unsupported operand types: null & string

PHP 8.x is more restrictive than 7.x.

- Michael Sy.