diff --git a/src/strategy_team/strategy_006.rs b/src/strategy_team/strategy_006.rs
index 5ebf3ea..79bf8f7 100644
--- a/src/strategy_team/strategy_006.rs
+++ b/src/strategy_team/strategy_006.rs
@@ -32,7 +32,8 @@ pub async fn list_up_for_buy(
         if let (Some(macd_vec), Some(rt_price_vec)) = (macd_1d_map.get(symbol), alldata.rt_price_1d_vec.get(symbol)) {
             if macd_vec.last().unwrap().close_time == rt_price_vec.last().unwrap().close_time && 
             rt_price_vec.last().unwrap().close_time > server_epoch {
-                if (macd_vec[macd_vec.len()-1].macd_value - macd_vec[macd_vec.len()-1].signal_value).is_sign_negative() &&
+                if macd_vec.len() >= 30 &&
+                (macd_vec[macd_vec.len()-1].macd_value - macd_vec[macd_vec.len()-1].signal_value).is_sign_negative() &&
                 (macd_vec[macd_vec.len()-2].macd_value - macd_vec[macd_vec.len()-2].signal_value).is_sign_negative() &&
                 (macd_vec[macd_vec.len()-1].macd_value - macd_vec[macd_vec.len()-1].signal_value >
                 macd_vec[macd_vec.len()-2].macd_value - macd_vec[macd_vec.len()-2].signal_value) {