Problem: The issue here is that the user is getting an error 500 when trying to save his user fields.
Solution: Normally when we get error 500 we usually encourage our customers to enable the wordpress debugging, this way we can get an understanding of the error at hand.
To enable it please follow the instructions in the link below. https://www.a2hosting.com/kb/installable-applications/optimization-and-configuration/wordpress2/debugging-wordpress
Sometimes the error will help you to resolve the issue.
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