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 ('1f0bd51ec9f568407669dd2872b4c1d1', -1, 1714068879, 1714068879, '039368f8', 4, 0, 0)

Line : 187
File : sessions.php