The plugin has an NRE at Line 564 if Notify isnt installed because of the order the if statement checks the variables

private void SendNotify(BasePlayer player, string key, int type, params object[] obj)
{
    if (Notify.IsLoaded && _config.UseNotify) // <== this line. Notify.IsLoaded does not exist if Notify Fails to Load
        Notify?.Call("SendNotify", player, type, Msg(player, key, obj));
    else
        Reply(player, key, obj);
}

this happens even if the config setting to use Notify is turned to false because of the order  that the 2 variables are checked

Workaround is to either install Notify or edit the code to switch the 2 variables arround

Yup, it should have a null check before all of that.