This issue might be caused by a database error. Could you send a mail to support@lansweeper.com with the following:
- Program Files (x86)\Lansweeper\Service\Errorlog.txt, as present on your Lansweeper server.
- If it exists, the error log present in Program Files (x86)\Lansweeper\Website\App_Data.
- Program Files (x86)\Lansweeper\Service\Lansweeperservice.exe.config.
- Program Files (x86)\Lansweeper\Website\web.config.