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) VALUES ('f3d94d688f200e38621dc774aab4f06c', -1, 1714800760, 1714800760, '03936708', 21, 0)

Line : 158
File : sessions.php