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 ('6a334f0d2e70c752be5484e0f56454a4', -1, 1711645391, 1711645391, '12ea379a', -4, 0, 0)

Line : 187
File : sessions.php