diff --git a/internal/rpc/msg/server.go b/internal/rpc/msg/server.go
index 615097a1a..f38f6f66f 100644
--- a/internal/rpc/msg/server.go
+++ b/internal/rpc/msg/server.go
@@ -15,7 +15,6 @@
 package msg
 
 import (
-
 	"google.golang.org/grpc"
 
 	"github.com/OpenIMSDK/protocol/constant"
diff --git a/pkg/common/db/s3/minio/thumbnail.go b/pkg/common/db/s3/minio/thumbnail.go
index 5dfdaee09..49c376c9f 100644
--- a/pkg/common/db/s3/minio/thumbnail.go
+++ b/pkg/common/db/s3/minio/thumbnail.go
@@ -82,8 +82,7 @@ func (m *Minio) getImageThumbnailURL(ctx context.Context, name string, expire ti
 	}
 	key, err := m.cache.GetThumbnailKey(ctx, name, opt.Format, opt.Width, opt.Height, func(ctx context.Context) (string, error) {
 		if img == nil {
-			var reader *minio.Object
-			reader, err = m.core.Client.GetObject(ctx, m.bucket, name, minio.GetObjectOptions{})
+			reader, err := m.core.Client.GetObject(ctx, m.bucket, name, minio.GetObjectOptions{})
 			if err != nil {
 				return "", err
 			}
@@ -104,7 +103,7 @@ func (m *Minio) getImageThumbnailURL(ctx context.Context, name string, expire ti
 			err = gif.Encode(buf, thumbnail, nil)
 		}
 		cacheKey := filepath.Join(imageThumbnailPath, info.Etag, fmt.Sprintf("image_w%d_h%d.%s", opt.Width, opt.Height, opt.Format))
-		if _, err = m.core.Client.PutObject(ctx, m.bucket, cacheKey, buf, int64(buf.Len()), minio.PutObjectOptions{}); err != nil {
+		if _, err := m.core.Client.PutObject(ctx, m.bucket, cacheKey, buf, int64(buf.Len()), minio.PutObjectOptions{}); err != nil {
 			return "", err
 		}
 		return cacheKey, nil
diff --git a/pkg/rpcclient/notification/group.go b/pkg/rpcclient/notification/group.go
index d336e4b12..0ae3ac3ca 100755
--- a/pkg/rpcclient/notification/group.go
+++ b/pkg/rpcclient/notification/group.go
@@ -270,8 +270,8 @@ func (g *GroupNotificationSender) fillOpUser(ctx context.Context, opUser **sdkws
 			member, err2 := g.db.TakeGroupMember(ctx, groupID, userID)
 			if err2 == nil {
 				*opUser = g.groupMemberDB2PB(member, 0)
-			} else if !errs.ErrRecordNotFound.Is(err2) {
-				return err2
+			} else if !errs.ErrRecordNotFound.Is(err) {
+				return err
 			}
 		}
 	}