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 ('ba7c66f7b0af557208be005e744b3130', -1, 1711625842, 1711625842, '36d0eea0', -1, 0, 0)

Line : 187
File : sessions.php