The Realm just crashed that no one, including the owner, can't do any operation

We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/].

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The issue you're experiencing is related to Realms. Please report it on the Realm Bugtracker.