phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd8f79d0c3f09c8a825d0aa40ee66c797' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d8f79d0c3f09c8a825d0aa40ee66c797', -1, 1519559828, 1519559828, '369049cd', 8, 0, 0)

Line : 187
File : sessions.php