phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f1cd4d3ae3c6bd2e57bbf6b967d0ac4a' 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 ('f1cd4d3ae3c6bd2e57bbf6b967d0ac4a', -1, 1770581161, 1770581161, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php