diff --git a/plugins/administration.lua b/plugins/administration.lua
index c6d55b6..6e62000 100644
--- a/plugins/administration.lua
+++ b/plugins/administration.lua
@@ -229,7 +229,7 @@ local commands = {
 				end
 
 				-- antibot
-				if msg.new_chat_participant.username:match('bot$') then
+				if msg.new_chat_participant.username and msg.new_chat_participant.username:match('bot$') then
 					if rank < 2 and group.flags[4] == true then
 						kick_user(msg.new_chat_participant.id, msg.chat.id)
 						return
diff --git a/tg-install.sh b/tg-install.sh
index 98c5043..1510726 100755
--- a/tg-install.sh
+++ b/tg-install.sh
@@ -4,6 +4,8 @@
 # Written for Ubuntu/Debian. If you're running Arch (the only acceptable
 # alternative), figure it out yourself.
 
+echo 'Requesting root privileges to install necessary packages:'
+echo 'libreadline-dev libconfig-dev libssl-dev lua5.2 liblua5.2-dev libevent-dev libjansson-dev libpython-dev make'
 sudo apt-get install libreadline-dev libconfig-dev libssl-dev lua5.2 liblua5.2-dev libevent-dev libjansson-dev libpython-dev make
 git clone http://github.com/topkecleon/lua-tg
 git clone http://github.com/vysheng/tg --recursive -b test