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 ('73525ede7c10cbaadca04337c3dd0acd', -1, 1550319377, 1550319377, '12d4ded9', -4, 0, 0)

Line : 189
File : sessions.php