phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5d009ef6fa711860a11965625a85396d' 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 ('5d009ef6fa711860a11965625a85396d', -1, 1406221634, 1406221634, '36c68cb6', -1, 0, 0)

Line : 187
File : sessions.php