phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5a7f956c054066b31a14916f9d4b50be' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5a7f956c054066b31a14916f9d4b50be', -1, 1498380593, 1498380593, '369e321a', -1, 0, 0)

Line : 187
File : sessions.php