diff --git a/setup.cfg b/setup.cfg
index 4020402..396d18e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = yamlhttpforms
-version = 0.0.5
+version = 0.0.6
 author = Daniil F.
 author_email = mail@placeholder123.to
 description = HTTP forms defined in YAML
diff --git a/src/yamlhttpforms/form.py b/src/yamlhttpforms/form.py
index 9d69b07..b95cc83 100644
--- a/src/yamlhttpforms/form.py
+++ b/src/yamlhttpforms/form.py
@@ -28,6 +28,8 @@ class FormField:
             for attr in function.split('.'):
                 obj = getattr(obj, attr)
             self._default = obj
+        elif default is None:
+            self._default = None
         else:
             self._default = str(default)
         self.options: Optional[OptionsT] = None