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 ('ef53f2b086eaf49f59a10653e75846f5', -1, 1713532174, 1713532174, '12d95361', -4, 0, 0)

Line : 187
File : sessions.php