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 ('2bd51d7b96e9e5e7493a2702b3fe6aa3', -1, 1711616250, 1711616250, '03eb4be5', -9, 0, 0)

Line : 187
File : sessions.php