http://forums.bots-united.com/showthread.php?t=2309
It's not a bot problem. Also these "Run time errors" are AMX problems.
Take the latest AMX MOD X 1.0 - it is free of this issue with getting confused it when bot is kicked and player joined.
Ask at AMX board about it (I've already asked - You can find the link to the thread in the link above).