Ensure your custom firmware (Atmosphere) is up to date.

When FIFA 19 launched on the Switch in September 2018, it was immediately compared to the "Legacy Edition" label. The base version (v1.0.0) worked, but it was riddled with minor bugs:

If the game crashes, the update file may be corrupted, or you may be missing a required base version (e.g., you need to be on Update 1.1 or 1.2 for the patch to work).

The NSP update for FIFA 19 on the Nintendo Switch refers to the patches and updates distributed through the Nintendo eShop to enhance the gaming experience. These updates can include:

Nintendo Switch Context: Reviewing the complete package as of its final update (Title Update #??, typically 1.0.2 or similar). Note: "NSP update updated" implies the user has the base game plus all official patches applied, usually via digital backup loading on CFW.

Once complete, return to the home menu and launch the game.