diff --git a/interface.c b/interface.c
index df49bdc..f178f45 100644
--- a/interface.c
+++ b/interface.c
@@ -2564,6 +2564,9 @@ void print_channel_info_gw (struct tgl_state *TLSR, void *extra, int success, st
     tgl_peer_t *U = (void *)C;
     mpush_color (ev, COLOR_YELLOW);
     mprintf (ev, "Channel ");
+    if (U->flags & TGLCHF_OFFICIAL) {
+      mprintf (ev, "(official) ");
+    }
     print_channel_name (ev, U->id, U);
     if (C->username) {
       mprintf (ev, " @%s", C->username);
@@ -3234,6 +3237,7 @@ void user_status_upd (struct tgl_state *TLS, struct tgl_user *U) {
 }
 
 void on_login (struct tgl_state *TLS);
+void on_failed_login (struct tgl_state *TLS);
 void on_started (struct tgl_state *TLS);
 void do_get_values (struct tgl_state *TLS, enum tgl_value_type type, const char *prompt, int num_values,
           void (*callback)(struct tgl_state *TLS, const char *string[], void *arg), void *arg);
@@ -3257,7 +3261,8 @@ struct tgl_update_callback upd_cb = {
   .secret_chat_update = secret_chat_update_gw,
   .msg_receive = print_message_gw,
   .our_id = our_id_gw,
-  .user_status_update = user_status_upd
+  .user_status_update = user_status_upd,
+  .on_failed_login = on_failed_login
 };
 
 
@@ -3520,6 +3525,7 @@ void interpreter_ex (char *line, void *ex) {
     if (op == ca_string || op == ca_file_name || op == ca_command) {
       if (cur_token_end_str || cur_token_len < 0) {
         if (opt) {
+          args[args_num ++].str = NULL;
           flags ++;
           continue;
         }
diff --git a/loop.c b/loop.c
index 0dd11cd..45ce448 100644
--- a/loop.c
+++ b/loop.c
@@ -755,6 +755,13 @@ void on_login (struct tgl_state *TLS) {
   write_auth_file ();
 }
 
+void on_failed_login (struct tgl_state *TLS) {
+  logprintf ("login failed\n");
+  logprintf ("login error #%d: %s\n", TLS->error_code, TLS->error);
+  logprintf ("you can relogin by deleting auth file or running telegram-cli with '-q' flag\n");
+  exit (2);
+}
+
 void on_started (struct tgl_state *TLS);
 void clist_cb (struct tgl_state *TLSR, void *callback_extra, int success, int size, tgl_peer_id_t peers[], tgl_message_id_t *last_msg_id[], int unread_count[]) {
   on_started (TLS);
diff --git a/tgl b/tgl
index 5b18232..f9534a2 160000
--- a/tgl
+++ b/tgl
@@ -1 +1 @@
-Subproject commit 5b18232e9ba1ec696843710b851120a2653cc801
+Subproject commit f9534a2a09fe4c89c9fecfd412fd1bfd4bcda8d3