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 ('e04e6dd9fbd5ce8b9c8d4522f0c3fb50', -1, 1544933762, 1544933762, '0350da35', 212, 0, 0)

Line : 172
File : sessions.php