Getting the following error message when using session_start() at the production page (on local setup, it works):
session_start(): open(/tmp/sess_8fhosqep8kdvras8sjtf8tgg9e, O_RDWR) failed: Permission denied (13)
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Is the folder writable? Have you cleared all sessions from the browser?
Folder was writable, session clearing didn’t help, clearing local storage and cookies helped.
What is your use-case for the PHP sessions? Kirby 3 has a built-in more robust session handling.
A plugin. 
You can also use the built-in sessions for it, no?
I could, if I would want to spend time on this plugin…^^
Since it seems like you are not even sure if this was the reason why this random error happened, im not sure if i want to give my time on that…
It’s actually rather simple to implement, I’d say simpler than the PHP sessions. 
We built our own implementation for pretty much that exact reason: That the built-in PHP implementation is sometimes pretty unreliable and can also be very insecure if configured incorrectly. 