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 ('c6321d2d6344b312d2d0f67d97a1a3ee', -1, 1571863303, 1571863303, '12d09f19', -4, 0, 0)

Line : 187
File : sessions.php