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 ('dd9e9cdf5b8d2d041ef66e87165d5150', -1, 1711658471, 1711658471, '23afd405', -7, 0, 0)

Line : 187
File : sessions.php