added a check for the nil value when requesting FindEntry. (#6651)

Co-authored-by: akosov <a.kosov@kryptonite.ru>

weed/filer/filer.go

@@ -3,12 +3,13 @@ package filer
 import (
 	"context"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/s3api/s3bucket"
 	"os"
 	"sort"
 	"strings"
 	"time"
 
+	"github.com/seaweedfs/seaweedfs/weed/s3api/s3bucket"
+
 	"github.com/seaweedfs/seaweedfs/weed/cluster/lock_manager"
 
 	"github.com/seaweedfs/seaweedfs/weed/cluster"
@@ -289,7 +290,7 @@ func (f *Filer) ensureParentDirectoryEntry(ctx context.Context, entry *Entry, di
 		glog.V(2).Infof("create directory: %s %v", dirPath, dirEntry.Mode)
 		mkdirErr := f.Store.InsertEntry(ctx, dirEntry)
 		if mkdirErr != nil {
-			if _, err := f.FindEntry(ctx, util.FullPath(dirPath)); err == filer_pb.ErrNotFound {
+			if fEntry, err := f.FindEntry(ctx, util.FullPath(dirPath)); err == filer_pb.ErrNotFound || fEntry == nil {
 				glog.V(3).Infof("mkdir %s: %v", dirPath, mkdirErr)
 				return fmt.Errorf("mkdir %s: %v", dirPath, mkdirErr)
 			}