phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '61708d123eea397c8a3bfbe7778c6ff0' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('61708d123eea397c8a3bfbe7778c6ff0', -1, 1768601417, 1768601417, 'd849d8d0', -10, 0, 0)

Line : 187
File : sessions.php