What are the steps to reproduce this issue?

1. Go to servers
2. Choose server
3. Right click on target
4. Choose Kick

What happens?

Message says something like this:
"Player 'PLAYERNAME' has been kicked from the server."

Server not kick a player, player or bot still on server

What were you expecting to happen?

Kick player from server

Any logs, error output, etc.?

Last logs from gameserver:

L 05/23/2018 - 05:22:07: World triggered "Round_Start"
L 05/23/2018 - 05:22:07: rcon from "193.26.217.146:59079": command "hlx_sm_psay "4,3" "HLstatsX:CE disabled! Need at least 4 active players (2/4)""
L 05/23/2018 - 05:22:08: "Antoha<4><STEAM_1:0:73206432>" picked up "ak47"
L 05/23/2018 - 05:22:24: "Antoha<4><STEAM_1:0:73206432>" left buyzone with [ weapon_knife_t weapon_glock weapon_ak47 ]
L 05/23/2018 - 05:22:25: "Antoha<4><STEAM_1:0:73206432>" left buyzone with [ weapon_knife_t weapon_glock weapon_ak47 ]
L 05/23/2018 - 05:22:25: rcon from "193.26.217.146:59129": command "status"
L 05/23/2018 - 05:22:27: rcon from "193.26.217.146:59129": command "kickid STEAM_0:0:73206432 "You have been banned by this server, check http://n14.serva4ok.ru/server664837/www/sourcebans/index.php for more info.""
L 05/23/2018 - 05:22:38: rcon from "193.26.217.146:59144": command "status"
L 05/23/2018 - 05:22:40: rcon from "193.26.217.146:59144": command "kickid STEAM_0:1:31019185 "You have been banned by this server, check http://n14.serva4ok.ru/server664837/www/sourcebans/index.php for more info.""
L 05/23/2018 - 05:22:47: "Emperor Palputin<3><STEAM_1:1:31019185>" dropped "hkp2000"
L 05/23/2018 - 05:22:47: "Emperor Palputin<3><STEAM_1:1:31019185>" dropped "knife"
L 05/23/2018 - 05:22:47: World triggered "killlocation" (attacker_position "-859 13 -116") (victim_position "-859 13 -116")
L 05/23/2018 - 05:22:47: "Emperor Palputin<3><STEAM_1:1:31019185>" [-859 13 -116] committed suicide with "world"
L 05/23/2018 - 05:22:47: Team "TERRORIST" triggered "SFUI_Notice_Terrorists_Win" (CT "0") (T "1")
L 05/23/2018 - 05:22:47: Team "CT" scored "0" with "1" players
L 05/23/2018 - 05:22:47: Team "TERRORIST" scored "1" with "1" players
L 05/23/2018 - 05:22:47: World triggered "Round_End"
L 05/23/2018 - 05:22:56: Starting Freeze period
L 05/23/2018 - 05:22:57: World triggered "Round_Start"
L 05/23/2018 - 05:22:57: rcon from "193.26.217.146:59079

Any other comments?

If you try kick bot, this says:
"Can't kick 'BOTNAME'. Player not on the server anymore!"

This is bug or so it should be with bots?

What versions of software are you using?

Operating System:
Linux
SourceBans++ Version:
SB++ 1.6.3
PHP Version:
5.6.30-0+deb8u1
MySQL Version:
5.5.54-0+deb8u1
Link to your project:
http://n14.serva4ok.ru/server664837/www/sourcebans/
Link to a phpinfo() output:
http://n14.serva4ok.ru/server664837/www/phpinfo.php