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 ('2d691e7f76569b5363bc63652532f2a8', -1, 1711721765, 1711721765, '03ef0f2e', 4, 0, 0)

Line : 187
File : sessions.php