need(s)?

[Solo]

Is 'needs' in the following sentence correct?
Wrong is one of those concepts that needs witnesses.
I mean, shouldn't it be 'need'?
Thank you

[Cerberus™]

It is correct:
Wrong is one of those concepts that needs witnesses.

The attribute "of those concepts" is not the "core" or "head" of the subject of the main clause; that is "one", which is singular. The relative pronoun "that" refers to the subject of the main clause. Depending on context it is also possible that "one" is not subject but subject complement, to which applies the same as above.