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 ('4245f69790e4b8ff6d3338b4f32f7abd', -1, 1713911947, 1713911947, '1277a09a', 0, 0, 0)

Line : 187
File : sessions.php