Update datajoint/external.py

Co-authored-by: Raphael Guzman <[email protected]>

Author: zitrosolrac

datajoint/external.py

@@ -352,7 +352,7 @@ def delete(self, *, delete_external_files=None, limit=None, display_progress=Tru
                             self._remove_external_file(external_path)
                         except Exception as error:
                             # adding row back into table after failed delete
-                            self.insert1(row[0])
+                            self.insert1(row[0], skip_duplicates=True)
                             error_list.append((uuid, external_path,
                                                str(error) if errors_as_string else error))
             return error_list