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 ('663fc511dff1c9208d02c520f07dcad6', -1, 1539609081, 1539609081, '36c637a7', 7, 0, 0)

Line : 187
File : sessions.php