diff --git a/graphene_django/fields.py b/graphene_django/fields.py
index c9b4942..6383258 100644
--- a/graphene_django/fields.py
+++ b/graphene_django/fields.py
@@ -199,4 +199,6 @@ class DataLoaderField(DjangoField):
 
         if self.load_many:
             return self.data_loader.load_many(source_loader)
-        return self.data_loader.load(source_loader)
+        if source_loader:
+            return self.data_loader.load(source_loader)
+        return None