phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'cb9f332ce95971fe3796def25e1f4ef6' 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 ('cb9f332ce95971fe3796def25e1f4ef6', -1, 1484579803, 1484579803, '36a64b50', -1000, 0, 0)

Line : 187
File : sessions.php