phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6695b37713cf1e541d4f4217d329738d', -1, 1544934509, 1544934509, '0350da35', 119, 0, 0)

Line : 172
File : sessions.php