--- erc-pcomplete.el.orig	2015-10-27 01:28:35.876740090 -0300
+++ erc-pcomplete.el	2015-10-27 01:26:24.850756000 -0300
@@ -225,9 +225,9 @@
                  (erc-get-channel-user-list)))
         (nicks nil))
     (dolist (user users)
-      (unless (and ignore-self
-                   (string= (erc-server-user-nickname (car user))
-                            (erc-current-nick)))
+      (unless (or (not user) (and ignore-self
+                                  (string= (erc-server-user-nickname (car user))
+                                           (erc-current-nick))))
         (setq nicks (cons (concat (erc-server-user-nickname (car user))
                                   postfix)
                           nicks))))