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 ('59e64496729572580d0f1260cdb2c7cf', -1, 1713853967, 1713853967, '031042ce', -9, 0, 0)

Line : 187
File : sessions.php