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 ('228ede955f4fea19571f96079c847494', -1, 1548316118, 1548316118, 'c0a865fd', -1, 0, 0)

Line : 187
File : sessions.php