attempt to fix crash

sync/models/base.py

@@ -132,9 +132,8 @@ class BaseModel(models.Model):
         children_by_model = self.get_children_by_model()
         for queryset in children_by_model.values():
             for child in queryset:
-                children.append(child)
-                # Recursively get children of children
                 if isinstance(child, BaseModel):
+                    children.append(child)
                     children.extend(child.get_recursive_children(processed_objects))
 
         return children