Reproduce the error with the following steps:
1. Go to: Data - > Company (Example)
2. There is the 'Big-Flower-Inc' tree.
3. Click 'Import Data'
4. The 'Ex-Company-1' appears without error
5. Click again 'Import Data'
6. An error occurs, the same dialog box as on the attached picture shows up, and the 'Ex-Company-2' tree appears.
7. Any other clicking on the import button the same error occurs.