phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4fa24c87fa87470b4e9407b9c09209de', -1, 1540244376, 1540244376, '365ca077', -4, 0, 0)

Line : 187
File : sessions.php