diff --git a/opal-core-ws/src/main/java/org/obiba/opal/web/FilesResource.java b/opal-core-ws/src/main/java/org/obiba/opal/web/FilesResource.java
index 8cbb0c69b0..cc99f225ea 100644
--- a/opal-core-ws/src/main/java/org/obiba/opal/web/FilesResource.java
+++ b/opal-core-ws/src/main/java/org/obiba/opal/web/FilesResource.java
@@ -97,7 +97,7 @@ public Response getFileSystemRootDetails() throws IOException {
   @NoAuthorization
   public Response getFileDetails(@PathParam("path") String path) throws IOException {
     FileObject file = resolveFileInFileSystem(path);
-    if (!file.getParent().isReadable() || !file.exists()) {
+    if (file.getParent() != null && !file.getParent().isReadable() || !file.exists()) {
       return getPathNotExistResponse("/" + path);
     }
     if (file.getType() == FileType.FILE) {