irc: fix crash on /list buffer when a filter is set (issue #2197)

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixed
 
+- irc: fix crash on /list buffer when a filter is set ([#2197](https://github.com/weechat/weechat/issues/2197))
 - core: fix build on Android ([#2180](https://github.com/weechat/weechat/issues/2180))
 
 ## Version 4.4.2 (2024-09-08)

src/plugins/irc/irc-list.c

@@ -506,6 +506,12 @@ irc_list_display_line (struct t_irc_server *server, int line)
     ptr_channel = (struct t_irc_list_channel *)weechat_arraylist_get (
         server->list->filter_channels, line);
 
+    if (!ptr_channel)
+    {
+        weechat_printf_y (server->list->buffer, line, "");
+        return;
+    }
+
     /* line color */
     if (line == server->list->selected_line)
     {