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 ('1a9e9255ec38f3982d2656652328266c', -1, 1711710674, 1711710674, '0359c89b', -4, 0, 0)

Line : 187
File : sessions.php