phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c1986d7810cbf1c118a206dda6ab2390' 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 ('c1986d7810cbf1c118a206dda6ab2390', -1, 1770318462, 1770318462, 'd849d83c', -9, 0, 0)

Line : 187
File : sessions.php