diff --git a/django_form_builder/dynamic_fields.py b/django_form_builder/dynamic_fields.py
index 052fe41..50b2bff 100644
--- a/django_form_builder/dynamic_fields.py
+++ b/django_form_builder/dynamic_fields.py
@@ -182,7 +182,11 @@ def define_value(self, choices, **kwargs):
             self.choices += _split_choices(splitted_string[0])
 
     def clean(self, *args, **kwargs):
-        # args = args if isinstance(args[0], list) else ([args[0]],)
+        try:
+            args = args if isinstance(args[0], list) else ([args[0]],)
+            if args[0] == None: args = ([],)
+        except IndexError:
+            args = ([],)
         return super().clean(*args, **kwargs)
 
     def raise_error(self, name, cleaned_data, **kwargs):
diff --git a/setup.py b/setup.py
index f54d3f2..f012504 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 setup(
     name='django-form-builder',
-    version='0.16.12',
+    version='0.16.13',
     packages=find_packages(),
     package_data={'': ['*.wav']},
     data_files=[