phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd40866e1f5cbe90d2ea48dd521288a62' 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 ('d40866e1f5cbe90d2ea48dd521288a62', -1, 1414014198, 1414014198, '36a67b02', 28, 0, 0)

Line : 187
File : sessions.php