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 ('9fe7a1b3c9d428f086d32f127377230a', -1, 1711651808, 1711651808, '03578545', -4, 0, 0)

Line : 187
File : sessions.php