diff --git a/welco/qualif/models.py b/welco/qualif/models.py
index 9c5916b..0ed0fe7 100644
--- a/welco/qualif/models.py
+++ b/welco/qualif/models.py
@@ -52,7 +52,10 @@ class Association(models.Model):
 
     @property
     def formdef_category(self):
-        return get_wcs_formdef_details(self.formdef_reference).get('category')
+        try:
+            return get_wcs_formdef_details(self.formdef_reference).get('category')
+        except AttributeError:
+            return '?'
 
     @property
     def formdata_url(self):