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 ('c2dd439b44c198a0c09f9be09b1d7bc1', -1, 1711710220, 1711710220, '03e9dd2a', -10, 0, 0)

Line : 187
File : sessions.php