Mattias Engdegård <mattias.engdegard@gmail.com> writes:

> In erc-ibuffer.el:
>
> (define-ibuffer-column
>  erc-members (:name "Users")
>   (if (and (eq major-mode 'erc-mode)
> 	   (boundp 'erc-channel-users)
> 	   (hash-table-p erc-channel-users)
> 	   (> (hash-table-size erc-channel-users) 0))
>      (number-to-string (hash-table-size erc-channel-users))
>     ""))
>
> Perhaps I'm mistaken but shouldn't hash-table-size be hash-table-count here?

Nice find! I've attached a patch that should fix the issue. If no one
says anything, I will add it or something similar in a few days. Thanks.