diff --git a/assemblyline_ui/api/v4/result.py b/assemblyline_ui/api/v4/result.py
index 4289e4dd..58061d96 100644
--- a/assemblyline_ui/api/v4/result.py
+++ b/assemblyline_ui/api/v4/result.py
@@ -153,8 +153,11 @@ def get_service_result(cache_key, **kwargs):
     if data is None:
         return make_api_response("", "Cache key %s does not exists." % cache_key, 404)
 
-    cur_file = STORAGE.file.get(cache_key[:64], as_obj=False)
-    data = format_result(user['classification'], data, cur_file['classification'], build_hierarchy=True)
+    cur_file = STORAGE.file.get(cache_key[:64], as_obj=False) or {}
+    data = format_result(user['classification'],
+                         data,
+                         cur_file.get('classification', CLASSIFICATION.UNRESTRICTED),
+                         build_hierarchy=True)
     if not data:
         return make_api_response("", "You are not allowed to view the results for this key", 403)