diff --git a/src/ralph/deployment/forms.py b/src/ralph/deployment/forms.py
index bfd284bd1b..9d534bb90e 100644
--- a/src/ralph/deployment/forms.py
+++ b/src/ralph/deployment/forms.py
@@ -17,7 +17,7 @@ def is_valid(self):
         is_valid = super().is_valid()
         try:
             _render_configuration(
-                self.cleaned_data['configuration'], MagicMock(),
+                self.cleaned_data.get('configuration', ''), MagicMock(),
                 disable_reverse=True
             )
         except TemplateSyntaxError as error: