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 ('21f058816b9c0a26c8d3120f31d2214a', -1, 1713617149, 1713617149, '03886140', 3, 0, 0)

Line : 187
File : sessions.php