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 ('8ad733a6c1a0ebb4f5be7a7d5187bf52', -1, 1713591776, 1713591776, '0d3bda93', 3, 0, 0)

Line : 187
File : sessions.php