fix #883

irc/nickname.go

@@ -120,8 +120,7 @@ func fixupNickEqualsAccount(client *Client, rb *ResponseBuffer, config *Config)
 	if !client.registered {
 		return true
 	}
-	// don't need to supply a nickname, SetNick will use the account name
-	if !performNickChange(client.server, client, client, rb.session, "", rb) {
+	if !performNickChange(client.server, client, client, rb.session, client.AccountName(), rb) {
 		client.server.accounts.Logout(client)
 		nsNotice(rb, client.t("A client is already using that account; try logging out and logging back in with SASL"))
 		return false