diff --git a/src/c3nav/editor/forms.py b/src/c3nav/editor/forms.py
index 9058a8d9..163ccbab 100644
--- a/src/c3nav/editor/forms.py
+++ b/src/c3nav/editor/forms.py
@@ -93,11 +93,6 @@ class MapitemFormMixin(ModelForm):
             if not self.cleaned_data.get('geometry'):
                 raise ValidationError('Missing geometry.')
 
-        if hasattr(self.instance, 'titles') and not any(self.titles.values()):
-            raise ValidationError(
-                _('You have to select a title in at least one language.')
-            )
-
         super().clean()
 
 
diff --git a/src/c3nav/editor/models/changeset.py b/src/c3nav/editor/models/changeset.py
index 5251f6fd..d03ac3c2 100644
--- a/src/c3nav/editor/models/changeset.py
+++ b/src/c3nav/editor/models/changeset.py
@@ -279,7 +279,8 @@ class ChangeSet(models.Model):
             objects[model] = {pk: model(pk=pk) for pk in pks}
 
         slug_submodels = tuple(model for model in object_pks.keys() if issubclass(model, LocationSlug))
-        object_pks[LocationSlug] = reduce(operator.or_, (object_pks[model] for model in slug_submodels))
+        if slug_submodels:
+            object_pks[LocationSlug] = reduce(operator.or_, (object_pks[model] for model in slug_submodels))
         for model in slug_submodels:
             object_pks.pop(model)
 
diff --git a/src/c3nav/mapdata/models/locations.py b/src/c3nav/mapdata/models/locations.py
index ecddc052..1f793666 100644
--- a/src/c3nav/mapdata/models/locations.py
+++ b/src/c3nav/mapdata/models/locations.py
@@ -28,7 +28,7 @@ class LocationSlug(SerializableMixin, models.Model):
         'LocationGroup': 'g'
     }
     LOCATION_TYPE_BY_CODE = {code: model_name for model_name, code in LOCATION_TYPE_CODES.items()}
-    slug = models.SlugField(_('Slug'), unique=True, null=True, max_length=50)
+    slug = models.SlugField(_('Slug'), unique=True, null=True, blank=True, max_length=50)
 
     objects = LocationSlugManager()