phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'fef2699e4ea9e30345053ca065e8d381' 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 ('fef2699e4ea9e30345053ca065e8d381', -1, 1493290778, 1493290778, '1714ca9c', -9, 0, 0)

Line : 187
File : sessions.php