When I create a Custom Field and give it a label using Greek characters, the result is a wrong column name ignoring all Greek characters
Settings > Custom Field > New
Table - User, Label ΣΣΣ (ΣΣΣ is Greek characters only)
The resulting column name is
If you don’t notice the problem and try to create a new custom field in the same table, again using Greek characters only, you get the MySQL error
Duplicate column name 'user_custom_' ALTER TABLE `ip_user_custom` ADD `user_custom_` VARCHAR(255) NOT NULL
The problem can be reproduced 100% of the time. The problem might be in effect with other non-latin sets.
As a workaround I create the custom field with a latin Label and then rename the label directly in the database.