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 ('a6c8df7250b59847b0d068715f4eeaf1', -1, 1713510213, 1713510213, '03889a67', -10, 0, 0)

Line : 187
File : sessions.php