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 ('7c2582a27c091be47c4a3fd2c89161ce', -1, 1711635915, 1711635915, '12e8a96e', -4, 0, 0)

Line : 187
File : sessions.php