diff --git a/weed/mount/page_writer/upload_pipeline.go b/weed/mount/page_writer/upload_pipeline.go
index bce062a6e..252dddc06 100644
--- a/weed/mount/page_writer/upload_pipeline.go
+++ b/weed/mount/page_writer/upload_pipeline.go
@@ -73,9 +73,7 @@ func (up *UploadPipeline) SaveDataAt(p []byte, off int64, isSequential bool) (n
 					fullness = chunkFullness
 				}
 			}
-			fullWritableChunk := up.writableChunks[fullestChunkIndex]
-			delete(up.writableChunks, fullestChunkIndex)
-			up.moveToSealed(fullWritableChunk, fullestChunkIndex)
+			up.moveToSealed(up.writableChunks[fullestChunkIndex], fullestChunkIndex)
 			// fmt.Printf("flush chunk %d with %d bytes written\n", logicChunkIndex, fullness)
 		}
 		if isSequential &&