Exceptions started to appear in all views, and when I try to run composer update, it always ends up with
{"error":{"type":"ErrorException","message":"array_merge(): Argument #2 is not an array","file":"\/laravel\/framework\/src\/Illuminate\/Foundation\/ProviderRepository.php","line":188}}
After a lot of searching and exploring each file in the 'app' folder, it appears that one file was corrupt
Delete app/storage/meta/services.json and re-run composer update and this should solve it.