diff --git a/data_sender.go b/data_sender.go
index cd97eff..d6f045d 100644
--- a/data_sender.go
+++ b/data_sender.go
@@ -6,6 +6,7 @@ import (
 
 	"context"
 	"encoding/json"
+	"fmt"
 	pb "loafle.com/overflow/crawler_go/grpc"
 	"loafle.com/overflow/cron_go"
 	q "loafle.com/overflow/queue_go"
@@ -104,9 +105,12 @@ func saveFailedData(datas []*Data) {
 		if err != nil {
 			log.Println(err)
 		}
-		_, err = file.Write(bytes)
-		if err != nil {
-			log.Println(err)
+		if bytes != nil {
+			fmt.Println("write : ", string(bytes))
+			_, err = file.Write(bytes)
+			if err != nil {
+				log.Println(err)
+			}
 		}
 	}
 }