phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'df6c966c00e61bfe4b84f66fd39346d7' 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 ('df6c966c00e61bfe4b84f66fd39346d7', -1, 1766839813, 1766839813, 'd849d82e', -4, 0, 0)

Line : 187
File : sessions.php