the user might be null

service/src/main/java/lcsb/mapviewer/services/impl/FileService.java

@@ -28,8 +28,9 @@ public class FileService implements IFileService {
   @Override
   public User getOwnerByFileId(int id) {
     UploadedFileEntry entry = uploadedFileEntryDao.getById(id);
-    if (entry != null) {
-      uploadedFileEntryDao.getById(id).getOwner().getLogin();
+    if (entry != null && entry.getOwner() != null) {
+      //it's lazy initialized
+      entry.getOwner().getLogin();
       return uploadedFileEntryDao.getById(id).getOwner();
     } else {
       return null;