phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1f7a9bd893c60337e2d1dd8c39c6c4a3' 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 ('1f7a9bd893c60337e2d1dd8c39c6c4a3', -1, 1416868653, 1416868653, '36e329f2', 12, 0, 0)

Line : 187
File : sessions.php