phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd409192a0c6252959ed3f52b4394569d' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d409192a0c6252959ed3f52b4394569d', -1, 1461979507, 1461979507, '36dd8ab8', 11, 0, 0)

Line : 187
File : sessions.php