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 ('41b96db68a9a023b24f5b58413d419b2', -1, 1529624090, 1529624090, '36a6e963', 4, 0, 0)

Line : 187
File : sessions.php