diff --git a/funcs/swifstat.go b/funcs/swifstat.go
index efc4335..fa71169 100644
--- a/funcs/swifstat.go
+++ b/funcs/swifstat.go
@@ -331,8 +331,8 @@ func swIfMetrics() (L []*model.MetricValue) {
 					}
 				}
 			}
+			lastIfStat[chIfStat.Ip] = chIfStat.IfStatsList
 		}
-		lastIfStat[chIfStat.Ip] = chIfStat.IfStatsList
 	}
 
 	endTime := time.Now()
diff --git a/g/const.go b/g/const.go
index 31f8b15..e976694 100644
--- a/g/const.go
+++ b/g/const.go
@@ -14,8 +14,9 @@ import (
 // 3.2.1.1 debugmetric support multi endpoints and metrics
 // 3.2.1.2 gosnmp use getnext to walk snmp
 // 4.0.0 caculate counter type on swcollect local,add speedpercent
+// 4.0.1 fix sometimes ifstat pannic
 
 const (
-	VERSION          = "4.0.0"
+	VERSION          = "4.0.1"
 	COLLECT_INTERVAL = time.Second
 )