diff --git a/cookbook/helper/open_data_importer.py b/cookbook/helper/open_data_importer.py
index 868704a4..8a022344 100644
--- a/cookbook/helper/open_data_importer.py
+++ b/cookbook/helper/open_data_importer.py
@@ -187,7 +187,7 @@ class OpenDataImporter:
         existing_data = {}
         existing_data_names = {}
         for obj in Food.objects.filter(space=self.request.space).values('pk', 'name', 'open_data_slug'):
-            if obj.open_data_slug:
+            if 'open_data_slug' in obj:
                 existing_data[obj['open_data_slug']] = obj
             existing_data_names[obj['name']] = obj