phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f2fbfcc52c56885ea96e8c93c62dc188' 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 ('f2fbfcc52c56885ea96e8c93c62dc188', -1, 1472040391, 1472040391, '36e0d6fb', -1, 0, 0)

Line : 187
File : sessions.php