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 ('7ad7f6317f6d7a4e1d1f7d60a0f80c04', -1, 1711631579, 1711631579, '12d13f78', -10, 0, 0)

Line : 187
File : sessions.php