Yes I do this, but not work too.
Code:
public plugin_init()
{
register_plugin(PLUGIN, VERSION, AUTHOR)
HamForward = RegisterHam(Ham_TakeDamage, "player", "ham_playertakedamage", 0);
DisableHamForward(HamForward);
// End round event
register_logevent("logevent_endround", 2, "1=Round_End");
}