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Swift: What “Invalid predicate: nil RHS” means and how to handle?

Sooner or later you will face with “Invalid predicate: nil RHS”. What does it mean? Fortunately solution is very simple, somewhere in your code, you are using NSPredicate with “CONTAINS” while your search text is nil. All you have to do is make sure to check and validate text entered by user.

The common mistake is using more then one “@” placeholders, while having only one parameter.

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