phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ca6af4fba00e9c6be3a230008a6df5dc' 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 ('ca6af4fba00e9c6be3a230008a6df5dc', -1, 1770187007, 1770187007, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php