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 ('7978614459838827a44f53db2d6fd5ad', -1, 1714004297, 1714004297, '038ac842', -4, 0, 0)

Line : 187
File : sessions.php