[Pierre-Marie Baty]

This may be caused because you lack client-side code for your bot. Your bot needs to know how to handle the VGUI network message the server sends it (like for example for choosing team and class). CS has a bug where it is possible to force a player to "play" even though the team and class have not been selected correctly, however as soon as this player dies, problems arise which resemble the one you mentioned (if I remember well).