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 ('f2aa113846659a0940424c5681b77d70', -1, 1711723713, 1711723713, '0358d3e3', -4, 0, 0)

Line : 187
File : sessions.php