diff --git a/lib/comm_plan/all.go b/lib/comm_plan/all.go
index 3121bdf..fa21ed0 100644
--- a/lib/comm_plan/all.go
+++ b/lib/comm_plan/all.go
@@ -725,7 +725,7 @@ func getCommissionRatio(typ string, level, peerNum int, grade map[int]*LvGrade)
 	case "team":
 		ratio = grade[level].TeamRate
 	case "same_lv":
-		if len(grade[level].PeerRate) == 0 {
+		if len(grade[level].PeerRate) == 0 || len(grade[level].PeerRate) >= peerNum+1 {
 			ratio = 0
 		} else {
 			ratio = grade[level].PeerRate[peerNum]