DB Error: Duplicate entry 'inbp020flukafjbn6o32lglbc7' for key 'sessions_pkey'

Stack Trace:

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\session\SessionDAO.inc.php line 88
Function: DAO->update("INSERT INTO sessions (session_id, ip_address, user_agent, cr...", Array(8))

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\session\SessionManager.inc.php line 91
Function: SessionDAO->insertSession(Object(Session))

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\session\SessionManager.inc.php line 130
Function: SessionManager->SessionManager(Object(SessionDAO), Object(Request))

File: D:\Sites\OJS_at_www.ijpis.net\classes\security\Validation.inc.php line 381
Function: SessionManager->getManager()

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\core\PKPPageRouter.inc.php line 66
Function: Validation->isLoggedIn()

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\core\Dispatcher.inc.php line 117
Function: PKPPageRouter->isCacheable(Object(Request))

File: D:\Sites\OJS_at_www.ijpis.net\lib\pkp\classes\core\PKPApplication.inc.php line 178
Function: Dispatcher->dispatch(Object(Request))

File: D:\Sites\OJS_at_www.ijpis.net\index.php line 65
Function: PKPApplication->execute()