Cannot return null for non-nullable field (EVEN THOUGH THIS FIELD IS NULLABLE)

[ImperatorOfIntellectualism]

Trying to do a basic query: query Query { threads { id createdAt title op Posts } }

Here is the error: "message": "Cannot return null for non-nullable field Thread.Posts.",

But here is this field: @Field(() => [String]) Posts: [string];

What the hell is this bug?? Can you fix it?