https://www.gamespot.com/articles/new-fortnite-update-coming-to-pc-tomorrow/1100-6457459/

Fortnite is getting a new update tomorrow, March 16, developer Epic Games has announced. This update is focused on fixing an issue with the PC edition related to crash analytics.

The good news is two-fold: the patch is fixing that crash issue and also, there will be no server downtime as the patch is applied. However, you might need to restart the game on PC to apply the patch. The patch will arrive at 3 AM PT / 6 AM ET, so you might be sleeping.