phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c078ad1c3d9b28b2f664a4286f7fbd63' 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 ('c078ad1c3d9b28b2f664a4286f7fbd63', -1, 1771859180, 1771859180, '2d971ed8', -9, 0, 0)

Line : 187
File : sessions.php