[Nibiuno]

I had the same issue, you can look at fixes in the bot crash on death thread a few posts down. This should fix it as well if you edit the source and recompile:

// Processes a group disband request from a Client for a Bot.
void Bot::ProcessBotGroupDisband(Client* c, std::string botName) {
if(c) {
Bot* tempBot = 0;

if(botName.empty())
tempBot = GetFirstBotInGroup(c->GetGroup());
else
tempBot = GetBotByBotClientOwnerAndBotName(c, botName);
// MOD ZEPHYR - stop bot disband
//RemoveBotFromGroup(tempBot, c->GetGroup());
// END MOD
}
}