"The environment file is invalid" ... But only on root? ( / )

Got Laravel 5.6 running on Envoyer, works very smooth... though for some reason I get an error if I just go to domain.com

"The environment file is invalid: Dotenv values containing spaces must be surrounded by quotes."

All other pages behave as they should. domain.com/a is ok, domain/a/b is ok, no error, images work. But domain root just won't work.

I've checked my .env vars, that I have set through Envoyer, no spaces, I've checked and double checked, everything is without space or enclosed in double quotes, besides, why would it just throw an error on one page but not everyone else, which also use the .env-vars?

Logged in to the server, ran php artisan config:clear, and cleared all other caches just to be on the safe side, then I used tinker to manually go through all .env vars, they were all loaded and accessible through Config::get() and env().

I run the EXACT same setup, -Forge and Envoyer on my local computer and it works as it should here. Same files, pretty much the same nginx-settings - the SSL cert.

I COMPLETELY removed ALL .env-settings in Envoyer and double checked that the .env-file was empty on the server, cleared all caches, including config:clear, tried the root page and still the same message, although I now have ZERO .env vars?

I tried re-deploying previous deployments, which has clearly been working before, but they also show the same error now.

Any help would be appreciated because I'm really out of ideas now.