Fortnite Down: How To Fix "Battle Buses Are Full" Error Code

A question mark in Fortnite.

Fortnite's new patch dropped today, but it looks as though fans are struggling to board the Battle Bus and get playing.

A new Fortnite "That Wasn't Supposed To Happen" error is preventing players from logging in.

Fortnite Down: How To Fix "Battle Buses Are Full" Error Code

Check out the screenshot below, with the error code "match.session_unavailable.402".

'That Wasn't Supposed To Happen' error in Fortnite.
click to enlarge

Uh oh

Luckily, it seems the issue is easy to fix - just make sure your game is updated.

Here's how to do that on all platforms:


Quit Fortnite, and if an update is available, it'll be downloaded via the Epic Games Store.


On Sony consoles, head to your dashboard and highlight Fortnite.

Press the options button, and then "Check for update".

Xbox One/Series S/Series X

On Xbox, head into "My Games and Apps".

From there, check the "Updates" section on the left, and ensure if Fortnite appears that you install it.

For more on Fortnite, check out our hubs on the Fortnite Chapter 4 Season 4 battle pass, alongside our guides on the new season's weapons and map.

For more articles like this, take a look at our Fortnite and Guides page.