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 ('789c08cf2c591b671657b491f9a61434', -1, 1638582682, 1638582682, '36e361db', 14, 0, 0)

Line : 187
File : sessions.php