diff --git a/users/forms.py b/users/forms.py
index 8c6f5db9..8793a4c6 100644
--- a/users/forms.py
+++ b/users/forms.py
@@ -340,7 +340,10 @@ class AdherentForm(FormRevMixin, FieldPermissionFormMixin, ModelForm):
         """On supprime l'ancien user de la chambre si et seulement si la
         case est cochée"""
         if self.cleaned_data.get('force', False):
-            remove_user_room(self.cleaned_data.get('room'))
+            room = self.cleaned_data.get('room')
+            if room is None:
+                raise forms.ValidationError("Invalid Room")
+            remove_user_room(room)
         return