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 ('fd7aca1b5e9b4e5cb257e5113efd9751', -1, 1711699795, 1711699795, '23ac79da', -1, 0, 0)

Line : 187
File : sessions.php