Mario Kart Tour has been updated to version 2.9.2 today by Nintendo. You can find out the complete patch notes for this Mario Kart Tour update from here.
The game is available on iOS and Android. It is basically one of the free games that still gets updated frequently by Nintendo. New content is usually added after the major update but the recent one only appears to address some minor issues including errors.
Mario Kart Tour Update 2.9.2 Patch Notes
Addressed known issues.
- Support Code: 805-9151 may be displayed after the start of a new tour and players cannot log in to the game.
- After loaunching the game, data may stopo at 12% and does not load any further.
- There is a low change that an error may occur when doing a Jump Boost during a race.
- Error 805-9874 may occur.