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 ('e7263f89ee44bb908aae6f91b3eb495c', -1, 1711678684, 1711678684, '3437d6ec', -7, 0, 0)

Line : 187
File : sessions.php