diff --git a/middleware/access_log.go b/middleware/access_log.go
index 129498f..6d89e43 100644
--- a/middleware/access_log.go
+++ b/middleware/access_log.go
@@ -32,6 +32,15 @@ func fillCfg(cfg *AccessConfig) {
 	if nil == cfg.ExtraFieldList {
 		cfg.ExtraFieldList = make([]string, 0)
 	}
+	if nil == cfg.RequestHeaderList {
+		cfg.RequestHeaderList = make([]string, 0)
+	}
+	if nil == cfg.ResponseHeaderList {
+		cfg.ResponseHeaderList = make([]string, 0)
+	}
+	if nil == cfg.ExtraFieldList {
+		cfg.ExtraFieldList = make([]string, 0)
+	}
 	cfg.ExtraFieldList = append(cfg.ExtraFieldList, define.RecordRequestDataField, define.RecordResponseDataField)
 }