diff --git a/pkg/agent/internal/metadata/metadata.go b/pkg/agent/internal/metadata/metadata.go
index a079a5d208..623b48f6ae 100644
--- a/pkg/agent/internal/metadata/metadata.go
+++ b/pkg/agent/internal/metadata/metadata.go
@@ -18,6 +18,7 @@
 package metadata
 
 import (
+	"io"
 	"os"
 
 	"github.com/vdaas/vald/internal/encoding/json"
@@ -46,7 +47,7 @@ func Load(path string) (*Metadata, error) {
 
 	var meta Metadata
 	err = json.Decode(f, &meta)
-	if err != nil {
+	if err != nil && err != io.EOF {
 		return nil, err
 	}
 
diff --git a/pkg/agent/sidecar/service/observer/observer.go b/pkg/agent/sidecar/service/observer/observer.go
index ee077c807c..f5ed32d553 100644
--- a/pkg/agent/sidecar/service/observer/observer.go
+++ b/pkg/agent/sidecar/service/observer/observer.go
@@ -153,6 +153,7 @@ func (o *observer) PostStop(ctx context.Context) (err error) {
 	backup := func() error {
 		metadata, err := metadata.Load(o.metadataPath)
 		if err != nil {
+			log.Warn("cannot read metadata of the backup files:", err)
 			return err
 		}
 
@@ -247,6 +248,7 @@ func (o *observer) startTicker(ctx context.Context) (<-chan error, error) {
 			case <-ct.C:
 				metadata, err := metadata.Load(o.metadataPath)
 				if err != nil {
+					log.Warn("cannot read metadata of the backup files:", err)
 					ech <- err
 					continue
 				}
@@ -324,6 +326,7 @@ func (o *observer) onWrite(ctx context.Context, name string) error {
 
 	ok, err := o.isValidMetadata()
 	if err != nil {
+		log.Warn("cannot read metadata of the backup files:", err)
 		return err
 	}
 
@@ -348,6 +351,7 @@ func (o *observer) onCreate(ctx context.Context, name string) error {
 
 	ok, err := o.isValidMetadata()
 	if err != nil {
+		log.Warn("cannot read metadata of the backup files:", err)
 		return err
 	}