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 ('001acc02e22ec12a26dc668b0cd9dad7', -1, 1542406814, 1542406814, '36525d74', -1031, 0, 0)

Line : 193
File : sessions.php