1 files changed, 14 insertions, 1 deletions
diff --git a/ishtar_common/serializers.py b/ishtar_common/serializers.py
index 507173642..071007ab2 100644
--- a/ishtar_common/serializers.py
+++ b/ishtar_common/serializers.py
@@ -8,6 +8,7 @@ from zipfile import ZipFile
 from django.apps import apps
 from django.conf import settings
 from django.core.serializers import deserialize
+from django.db.models.deletion import ProtectedError
 
 from django.contrib.auth.models import Group, Permission
 
@@ -438,7 +439,19 @@ def restore_serialized(
                     if not model or (current_model and current_model != model):
                         continue
                     if delete_existing:
-                        model.objects.all().delete()
+                        try:
+                            model.objects.all().delete()
+                            deleted = True
+                        except ProtectedError:
+                            deleted = False
+                        if not deleted:
+                            # only delete not referenced
+                            for item in model.objects.all():
+                                try:
+                                    item.delete()
+                                except ProtectedError:
+                                    pass
+
                     data = zip_file.read(json_filename).decode("utf-8")
                     # regenerate labels, add a new version, etc.
                     historized = hasattr(model, "history_modifier") and (