phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '155c3c6812a4556cbe5f77e6aab90fac' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('155c3c6812a4556cbe5f77e6aab90fac', -1, 1771982154, 1771982154, 'd849d8b4', -9, 0)

Line : 180
File : /www/includes/sessions.php