If there's a duplicate nickname in the database, I'd like to make an error

[qortmd3592st]

After making an ID, it’s successful to set up a nickname.

However, I want to make an error if the nicknames overlap when setting the nickname.

If the nicknames overlap, the account will be overwritten.

I’m Korean, so I used a translator.

The green circle is the ID and password, and the red circle is the nickname.

I desperately need help. I ask for your help. plzzzzz

[qortmd3592st]

I think I can fill in this blank. How should I fill it up?

[qortmd3592st]

[tatiang]

Take a look at the way the cloud variables are set up in these topics:

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