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 ('64a60e9d637ede50b3e63250e8218def', -1, 1711710302, 1711710302, '03ef5359', -4, 0, 0)

Line : 187
File : sessions.php