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 ('c3794588319a371e9c0c769fb7bbc531', -1, 1711688617, 1711688617, '03d74d58', -11, 0, 0)

Line : 187
File : sessions.php