phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7c5d1d99b9b2ed31bf44d23370c34c4c' 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 ('7c5d1d99b9b2ed31bf44d23370c34c4c', -1, 1770991078, 1770991078, 'd849d809', -4, 0, 0)

Line : 187
File : sessions.php