phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('05a60d4c4831e17f1924747142b21945', -1, 1539812059, 1539812059, '36e0f72a', 3, 0, 0)

Line : 187
File : sessions.php