diff --git a/weed/server/filer_server_handlers_write_upload.go b/weed/server/filer_server_handlers_write_upload.go
index 519f989c0..7756b5d59 100644
--- a/weed/server/filer_server_handlers_write_upload.go
+++ b/weed/server/filer_server_handlers_write_upload.go
@@ -105,7 +105,7 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque
 			}()
 
 			chunk, toChunkErr := fs.dataToChunk(fileName, contentType, bytesBuffer.Bytes(), offset, so)
-			if toChunkErr != nil {
+			if uploadErr == nil && toChunkErr != nil {
 				uploadErr = toChunkErr
 			}
 			if chunk != nil {