phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '226821dc0d4d1c4454b40800578faf63' 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 ('226821dc0d4d1c4454b40800578faf63', -1, 1527314631, 1527314631, '36510016', 21, 0, 0)

Line : 187
File : sessions.php