Undertale released an update on Switch today, bringing the game up to version 1.11. This patch is available for all players.
According to the official Twitter account, the new update addresses an important bug. Those who didn’t select a user when starting the game could result in accidental loss of save data. After installing the patch, you shouldn’t encounter any such issues.
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Source : https://nintendoeverything.com/undertale-switch-update-out-now-version-1-11/