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 ('c6b248e096d9e1bef6df0f67f07c53d1', -1, 1713420802, 1713420802, '031042ce', 5, 0, 0)

Line : 187
File : sessions.php