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 ('c20398c06dffa6675dc847193b3c79f1', -1, 1711633923, 1711633923, '12e8a96e', 2, 0, 0)

Line : 187
File : sessions.php